Problem: View All Threads by this user

[kh99]

In the settings in the adminCP, under "Message Searching Options", there's "Maximum Search Results to Return". You won't get more than that many posts no matter how many the user has. You could increase it, but searching take a lot of server resources, so if you allowed unlimited search results it might cause problems.

ETA: if you wanted to allow more just for yourself or a specific usergroup, you could probably create a plugin using hook search_before_process and reset $vbulletin->options['maxresults'].