I guess so. Just try to disable each one to find the issuer.smililes are not parsed anymore
this is very strange, in account/user-smilies they are still there and i can add new ones too, but in the editor and in the post it shows instead of the image just :test: and son on.
there were no updates on the forum software (latest version). do you have any idea what this could be or where i can start looking for possible conflicts?