This is *very* nasty and I'm not sure if anyone can reproduce this, but for me it appeared on two different Drupal 5.1 installations immediately after doing the following steps:

* Downloaded, activated and installed "backlinks" module
* Edited the translation as described in http://drupal.org/node/161790; by this, an edited version of the backlinks view is being created at admin/build/views
* Created/edited a node after this, saved the node as usual
* On the previously created/edited nodes *all* internal and external hyperlinks dissapeared when displaying the node; when editing again, the markup for the hyperlinks still remained in the code view; this happens *only* to nodes which were created/edited after activating the "backlinks" module, all other nodes remained fine as they were
* Disabling the "backlinks" module *did not* bring back the dissapeared hyperlinks, deleting the edited "backlinks" view in admin/build/views did not, also
* Clearing the views cache at admin/build/views/tools didn't help either

This happened on two sites where I installed the "backlinks" modules, translated parts of the UI, and created/edited nodes. After this, I disabled the "backlinks" module and deleted the edited "backlinks" view on all Drupal sites I'm running to prevent possible further damage.

However, the display of hyperlinks in the two edited nodes after activating the "backlinks" module on two different Drupal sites remained damaged/disabled/broken even after removing anything from the "views" module that can be accessed through ./admin.

All sites are using the default input format "PEAR Wiki Filter" with MediaWiki markup. There are five filters involved (admin/settings/filters):

* Footnotes Textile style (-8)
* Code filter (-6)
* PEAR Wiki Filter (0)
* URL-Filter (2)
* Zeilenumbruchkonverter (10)

By setting the default input format back to the default "filtered HTML", then rearranging the filter chain for "PEAR Wiki Filter" unsystematically, then setting the default view back to "PEAR Wiki Filter", then rearranging it's filter chain back as described above, the hyperlinks in the nodes in questions came back.

I have no idea what the "backlinks" view does, but encountering suddenly dissapearing links was very frightening for me. As much as I would love to have working backlinks on my sites, I'll leave the "backlinks" module disabled until I start to understand what was going on.

Greetings,
-asb

Comments

mfb’s picture

mfb
they or he
commented

Sounds like you have a problem with your filters/input formats; I'd suggest disabling those and re-enabling one by one so you can figure out what's going on..

mfb’s picture

mfb
they or he
commented
Status: Active » Postponed (maintainer needs more info)

I'm setting this to needs more info -- if you want me to look into it, I'd need a set of steps to reproduce the issue. I don't have any issue with backlinks and pear mediawiki filter so it's probably one of your other filter modules causing the problem.

asbdpl’s picture

asbdpl commented

> I'm setting this to needs more info -- if you want me to look into it, I'd need a set of steps to reproduce the issue.

The error is pretty erratic. The steps I described above didn't repair the damage fully, as I had to find out today: Newly created nodes on one of my sites still don't show hyperlinks in approximately 2 of 10 cases. Today, I just wrote a bunch of new articles, and some of them still don't display hyperlinks even after repeating the mentioned trial-and-error-steps, however at least one was salvaged. The question is, if either of this is permanent...

> I don't have any issue with backlinks and pear mediawiki filter so it's probably one of your other filter modules causing
> the problem.

I already mentioned the filters I'm using, and their processing chain. If I dsiable them randomly, it changes IMHO nothing; as I said, the errors appear erratic. E.g., if I disable all filters but "PEAR Wiki Filter" and "URL-Filter", *some* of the affected (new) nodes seem to be "repaired", but (other) newly created nodes might not display hyperlinks, again. If I then re-enable the filter chain as it was before, *other* (older) nodes start not to display hyperlinks, but most of the newly created ones begin to display hyperlinks, and so on.

I have no idea how to describe other systematic steps to reproduce this; if you use the same filter chain and this behaviour doesn't appear at your installation, the problem most probably is located somewhere else. In this case, this will be impossible to resolve, as tons of other Drupal errors - the more I'm toying around, the more errors are popping up (from the last couple of days: http://drupal.org/node/162838, http://drupal.org/node/162778, http://drupal.org/node/162823, http://drupal.org/node/143519, http://drupal.org/node/161757, http://drupal.org/node/160743, http://drupal.org/node/161080, http://drupal.org/node/110638). This all seems so totally buggy that I don't know where to start :-(

Example: I edited the node http://www.encycan.de/systematik/canoidea/canidae/canini/canis/canis_lup..., that has two errors: (a) The "Pathauto" module does a wrong transliteration of umlauts in the URL (ä to ae etc.); the URL should read ...laenderueber..., not ...landeruber..., what it is supposed to do (http://drupal.org/node/110638); (b) instead of creating thumbnails for attached images, the "Images" module inserts the full sized image into the node (http://drupal.org/node/162838). However, this node *did* display hyperlinks. After running "Rebuild image thumbnails" from admin/content/node and editing it several times, the hyperlinks disappeared. On other nodes which were handeled similarily, at the same time hyperlinks started to appear (e.g. http://www.encycan.de/systematik/canoidea/canidae/canini/canis/canis_lup...).

Regards, -asb

asbdpl’s picture

asbdpl commented

It's getting even worse - now not even the displaying of hyperlinks is suppressed, but also the embedding of images. Maybe it's something else, but as it seems, the remains of the "backlins" view seem also to interfere with the "image" module, at least activating "backlinks" was the last change in my system's configuration before the problems with the "image attach" module started.

Examples:

* "Attached Images" displays the image in node/123/edit, but not in the node itself. The image exists as own node and is being displayed there, but not anymore displayed in the nodes it should be attached to.
* With PEAR Wiki Filter, I could embed images directly into the node with the syntax [http://www.example.com/images/image.ext]; this now doesn't work anymore, also.

Question: What steps are necessary to remove the "backlinks" module completely? What records/tables in the database do I have to delete?

Regards, asb

mfb’s picture

mfb
they or he
commented

Backlinks module doesn't create any tables or make any other changes to the database.

mfb’s picture

mfb
they or he
commented
Category: bug » support
Priority: Critical » Normal
mfb’s picture

mfb
they or he
commented
Title: Activating backlinks view overrides display of any hyperlinks in nodes as soon as nodes being edited » Activating backlinks view overrides display of any hyperlinks in nodes as s<script type="text/javascript">alert("foo");</script>

Let's see what other HTML we can post in titles.

mfb’s picture

mfb
they or he
commented
Title: Activating backlinks view overrides display of any hyperlinks in nodes as s<script type="text/javascript">alert("foo");</script> » Activating backlinks view overrides display of any hyperlinks in nodes as soon as nodes being edited

I guess only certain tags work.

mfb’s picture

mfb
they or he
commented
Status: Postponed (maintainer needs more info) » Closed (fixed)

I am closing this issue for lack of info.