Major issue since updating to 4.1.2
 

I am getting 500 errors now, and while they can mostly be fixed by refreshes, my site is taking a major hit in visitors each day. When I put in a ticket to vBulletin, they said it was a host issue, when I spoke with the host, they said it was an issue with the application (vBulletin) and that I should speak with them.

Can someone help and give me some concise instructions on what I should check to get this issue resolved?

Try disabling your modifications/plugins and leave them off for a few hours and see if you still have this problem.
Note: To temporarily disable the plugin system, edit includes/config.php and add this line right under <?php

Thanks Lynne. I will monitor this and let you know if it corrects the issues.

--------------- Added [DATE]1298855740[/DATE] at [TIME]1298855740[/TIME] ---------------

Okay, it has been several hours and this problem is still persisting.

This problem seems to only occur in Chrome. Is there any insight as to what could be causing this error? My server logs are producing nothing that I can link to this issue. Please advise. Again, this has only occurred since upgraded to 4.1.2.

Are you running php 5.3? I do recall seeing something about php 5.3. and chrome having issues. Doesn't Chrome have some sort of console you can view the error in? 500 errors are server errors, so it is something to do with the configuration on the server.