Wow, thanks very much, that worked. I wonder why the upgrade instructions explicitely tell you to _not_ upgrade the index.php file when keeping the old one is what causes the blank pages..
Downgraded to the 1.5-beta-1 nightly again. Phew. I guess this is a bug in the final 1.5 release, judging from the number of threads on this issue. Hope it gets fixed quickly, and sorry for creating yet another thread.
