[VBDEV] Search "Match specific user" doesn't work

[dale_burrell]

If I search by username and click the "Match exact name" I get user unknown, yet if I untick that option I get the posts OK.

[dale_burrell]

Upon further inspection the problem is this:

Posts that I made prior to the upgrade can be found using 'dale_burrell' (Without the exact match checked)

However, posts made since the upgrade can only be found using 'dale_burrel' (Again without the exact match).

I wonder if there is a string length problem somewhere?