Just for those who are having problems with upgrading to 4.2.1, and if you have PHP 5.4.x installed, you may wish to know that they also don't even support PHP 5.4 (even though its been out since March 1012 and we're almost at May 2013 now!) to the list of problems. You can NOT upgrade to the 4.2.1 build if you have 5.4 installed. It has a major fit, :-(
They know about this, they've just not bothered to think to add support for 5.4.x... Even though they've had over a year to do so.
Apparently "Compatibility is still planned, yes - I don't have a date for it though I'm afraid." according to a post on the official vbulletin.com forums by Trevor Hannant.
Just thought I'd pass that info along incase anyone else has the same problems I and others have had, :-)
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