Different server name in URL. Weird!

Hm. IA is just an input filter and outputs regular links, just like any other Drupal module. My first guess would be to check whether other modules, such as Multidomain, Domain Access, Organic Groups, aso. might cause this by redirecting to the other domain upon form submission.

yes, all of that sounds odd. You might also want to check, which web server modules are enabled. For example, mod_security could be another cause for this.

However, I really can't imagine a chance that IA is the cause for this. Thus, marking as fixed. If you happen to find the cause for this issue, please let me know, so I can add an entry to the FAQ/Troubleshooting section in the README.txt.

Forgot to mark this as fixed.

I'm seeing this same issue. I have a test site running on localhost (also known as centurion). When I access the machine locally at http://localhost the image works, but when I access the machine from a different computer, using http://centurion instead, the image no longer works. Looking at the source of the web page, the image's src tag is http://localhost/... in both cases, which obviously fails when I am accessing centurion from another server.

Since dccircuit above could fix it by adding a space I figured I'd try the same thing. My img_assist tag is the very first thing in my post. Putting the word "banana" right in front of the tag fixed it. But putting banana in front and putting a space also fixed it. Then I tried putting a carriage return or many carriages returns in front of it and that fixes it too. If I remove all the carriage returns, it is broken again, as the link goes to http://localhost

Still not sure if this is a bug or something weird with our configurations. It could be apache's fault although why would putting some carriage returns in the body of the post (which get filtered out anyways by the filtered html input format) cause apache to do anything different?

Reopening, if you don't mind...

What happens if you access your site via http://centurion, visit http://centurion/img_assist/cache/clear, and check your nodes' output afterwards?

FYI: This is the regular expression that is used to replace the inline tags:

preg_match_all('/ \[ ( [^\[\]]+ )* \] /x', $text, $matches);

Don't be scared by the spaces - the x modifier sets the pattern to ignore whitespace unless it is noted literally (escaped).

sun, I also looked at that regex and was also wondering about the spaces. Then I looked up what the x option was for :-)

Clearing the cache fixes it! I thought it was maybe a cache issue, thanks a lot. So once this site is in production I will no longer have this issue. Is there a way to disable the img_assist cache? I usually leave all caching off while I am developing a site.