We did move move the vB forum from /forum/ to / when we migrated and we had a few issues with our redirects and vBSEO rewrites. I'm not sure if we got it working by brute force or by the correct method but this may be a further complication. Had a LOT to do in the past few days post-migration so this hasn't been a top priority yet.
I think this must be a caching issue or a PHP 5.4 issue. It works for a small period of time after an Apache restart and then starts to fail. I've also noticed another problem that follows this similar patter. Users cannot save a new email address in their profile.
Server is at max debug and it's still not showing anything useful. Perhaps the error is suppressed?
No error displayed but the timeframe is the same. After an Apache restart, this email change returns "Changes Saved" overlay. After awhile, both the RSS and the email change fail (Actually, the email change just does nothing and a refresh displays the old settings) We're seeing some PID #### segafult errors in the server logs but nothing that specifically gives a clue about this.
I just disabled all add-ons, restarted Apache and am still running fine 1 hour later. I'm going to give it another hour and see if anything begins to fail and then start re-enabling add-ons one at a time with around an hour in between.
A segfault isn't a lack of memory. It's a process that is violating it's memory space. If APC was out of memory it should result in poor cache performance, not segfaults. The question remains, what process is attributed to that segfault error?