Hello,

Having an AbuseFilter warning when trying to edit an article the title of which contains an exclamation mark causes a message about loss of session data to appear [1] and prevents any subsequent attempt to publish the changes to succeed [2].
It seems that disabling the AbuseFilter warning is the only way to allow the article to be edited again.

The bug has been seen for the following articles :
http://fr.wikipedia.org/wiki/Hou_!_La_menteuse
http://fr.wikipedia.org/wiki/Qu%27il_est_b%C3%AAte_!
http://fr.wikipedia.org/wiki/Indignez-vous_!

The warning has been disabled for the first two articles, but you may want to try to edit the third one (before I disable the warning for this one too).

It seems that this bug was introduced somewhere between September 9th and December 29th (because the first article was edited on September 9th and I'm pretty sure the warning was already there at that time).

I dumped the HTTP requests and it looks like the information sent to the server (cookies included) is almost the same before and after the warning.

I'd be happy to help with more information / tests; just ask me.

BTW, related discussions (in French) about this bug can be found there:

• http://fr.wikipedia.org/wiki/Wikip%C3%A9dia:Le_Bistro/29_d%C3%A9cembre_2010#Hou_.21_La_menteuse
• http://fr.wikipedia.org/wiki/Wikip%C3%A9dia:Le_Bistro/8_janvier_2011#D.C3.A9connexion_intempestive_lors_de_la_modification_d.27un_article_en_R3R

Best regards,

[1] `Sorry! We could not process your edit due to a loss of session data. Please try again. If it still does not work, try logging out and logging back in.'
[2] Basically, what happens is:

• edit
• publish ⇒ abusefilter warning
• publish ⇒ loss of data session warning
• publish ⇒ abusefilter warning
• publish ⇒ loss of data session warning
• publish ⇒ abusefilter warning
• publish ⇒ loss of data session warning
• …

Version: unspecified
Severity: major