I have recently upgraded to version 4, and now when I see a member and want to click on all their posts, I am lucky if I only get a few. I then went to click on my own user to "view all posts by this user" and I get this link http://www.realestatewebmasters.com/...?searchid=4223 - if you follow the pagination to the end, it maxes out at 500 posts.
I have updated my search counter or whatever you call it in the admin section, I hoped that would help, but it didn't. I (and many others have) 15,000+ posts - and the search only shows 500 (also not being able to easily select and delete the posts of drive by spammers is REALLY annoying.