The way I used to upgrade to 2.0.6 from 2.05 is backup all database from PHPMyAdmin control panel and output the .sql file. Wiped out the old stuffs and installed new version then use SQL to restore the database. Because it works fine for me last time.

But this time every thing seems work fine except the 'Site Preference>Mail setup' after I restore the database from the backup file (.sql).

It displayed blank page when I click Mail setup. So I tried to find out why, then I found the number of users in database (_users)seems to be the key. I tried restored only 372 users (after many trials)to database and it shows blank page, but it appears normal again after I delete 1 user from database. To be sure it was not caused by the process of restoring, so I registered an new user then it comes up blank page again when I click the 'mail setup', but resume normal after I deleted one user from database, it seem like 371 is the threshole... anybody have a clue how to fix it? Tks

same here ... any solution??

First go through this Faq Page for troubleshooting blank pages, to help narrow down the problem.

Same thing happens to my site... The Blank Page FAQ didn't helped at all... My site was working perfectly on a different server and now i can't go to this admin page and i don't receive any notification emails... (new user registration emails are received perfectly)

Debug in not showing anything at all... Can someone help?

I forgot to mention that my database has 3762 users at the moment and i'm not in a position to start deleting users just to see if this helps...