We were also getting php errors concerning preg_replace() /e being depricated and to use preg_replace_callback() instead. For each reported occurrence, I made the change in the affected .php file. Would I not have had to do that with this fix??
Probably a error with a mod, see if you can find out which one.
I guess my real question should have been, is it necessary to undo the changes? So far, everything is working as expected. Rule of thumb is, "If it ain't broke, don't fix it." As nothing is presenting as broke, I wont 'fix' the 'fixes' I fixed.
Well the change I told you to do in post #2 would have been overwritten when you loaded the new files to the server. As well as any other changes you made to the core files.