The 5.10.0 release contained some debug code that break part of the user registration process. After breaking it newly added code should fix it again. While the fixing code works it is proper to leave this debug code in.
Only the 5.10.0 is affected. Upgrade to 5.10.1 or install this hotfix.

Problem description:

The user ID was unset during user registration in vBulletin. Code was added to recover the user ID when it was lost during registration. This could cause vBulletin and Drupal users to have different IDs. The user id recovery code works, but it's not correct to always rely on this code even when the user ID was initially not lost.

Applies to version:

Instructions:

Download the file an overwrite the vbuser.module in drupal/modules/vbuser/

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