New version 0.2 (see initial post from Brian)

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Using Phorum since 7/2000: forum.langzeittest.de (actual version 5.2.23)
Modules "Made in Germany" for version 5.2: Author_as_Sender, CarCost, Close_Topic, Conceal_Message_Timestamp,
Format_Email, Index_Structure, Mailing_List, Pervasive_Forum, Spritmonitor, Terms_of_Service and German_Language_Files_Package.

I'm using the spam hurdles module and I get this error:

Warning: Incompatible template files detected

Not all template files contain the template hook {HOOK "tpl_editor_before_textarea"} that is required for the posting protection to work. If your Phorum site is using the following template files, then check them against the template files in the Phorum distribution and add the required hook code to them:
./templates/mobile/posting.tpl from the Phorum Mobile Template 0.2 template

I'm using other spam blocking modules now. So the fact that this one didn't work is no big deal :(