GeshiFilter Does not Add Span Tags (After upgrade to 6.x)

I'm guessing it's because 6.x-1.2 is still untested

6.x-1.2 is not untested, it works on my setups and also does for other users (there are approximately 8 times more users of the Drupal 6 version than the Drupal 5 version of this module)

GeshiFilter works by including tags rgb( etc etc).

What do you mean with this? there is no rgb stuff involved in either version of the module

In the 6.x site, Firebug shows, that Geshifilter does not insert any span tags. It's just black text, no highlighting going on.

This seems to indicate that GeSHi filer is not called in the filter pipeline. Are you sure you have your input filters set up correctly?

You refer to an update, does this mean that you upgraded a Drupal5 site with GeSHi filtered content to a Drupal6 site with GeSHi filter?

Thanks for your response, this makes things much clearer.

Can you check it the GeSHi filter can find the GeSHi library (is there any error on the admin page)?
And which version of the library are you using? GeSHi filter only supports 1.0.x, not 1.1.x

Can you also try with an input format that only contains the GeSHi filter?

Did you already try to flush the GeSHi language definition cache? (button is under the textfield for setting the path to the GeSHi library.)

the Drupal5 and Drupal6 language definition files are provided separately from the language definition files bundled with the GeSHi library itself.
So if you only have Drupal5 and Drupal6 as possible languages, there is something wrong with the detection of the normal language definition files.

The GeSHi filter module expect these language definition files to be in the folder [geshilib]/geshi/, with [geshilib] the folder of the GeSHi library, which is typically sites/all/modules/geshifilter/geshi/, so those hundreds language definition files should be under sites/all/modules/geshifilter/geshi/geshi/.

Did you change the directory structure of the GeSHi library?

as a reference, here is the code that defines where the language definition files are searched for:

function _geshifilter_get_geshi_dir() {
  return variable_get('geshifilter_geshi_dir', drupal_get_path('module', 'geshifilter') .'/geshi');
}

...

function _geshifilter_get_available_languages() {
  ....
      $dirs = array(_geshifilter_get_geshi_dir() .'/geshi', drupal_get_path('module', 'geshifilter') .'/geshi-extra');
      foreach ($dirs as $dir) {
        foreach (file_scan_directory($dir, '\.[pP][hH][pP]$') as $filename => $fileinfo) {
          ...
}