We upgraded from vBulletin 4.2.2 PL 3 to 4.2.3 Beta 3 when we upgraded our server toUbuntu 14.04.1 LTS, which included PHP 5.5. As you recall, vBulletin 4.2.2 wasn't compatible with PHP 5.5, and was giving us all sorts of issues. 4.2.3 Beta 3 fixed all of that. But is was our upgrade to 4.2.3 Beta 3 that resulted in the problem with Paid Subscriptions.

I would really rather be using the same file versions that Paid Subscriptions use, but the problem must be identified and fixed before I consider putting those version files back.