Hey people im just having problem with this and i even tried the following:

Go to plugins/content ant place a copy of jwsig.php wich and name it jw_sig.php and all works fine..So you have the original jwsig.php and jw_sig.php in the same folder.. Its a cheat but works wthout hacking core files.

 

But I couldnt find any file by the name jwsig.php rather i found a file named jw_simpleimagegallery.php. i had this underscore before i could do any changes to it, as u people said we should copy paste n then add this underscore, but it already exists in there, what shall i do now?? Can any help me?