Re: White Pages whenever Hitting Submit
I switched back to the original BP theme, it seems to work correctly there. Where do I have to start looking then?
Compare the default theme files with your custom theme files. Also, you could be missing code in your functions.php file. Copy the code out of bphome/functions.php and paste it into your themes’ functions.php file.
Another question, if I started to work with the trac files to modifiy the new theme structure from the scratch, do I have to fear more changes until the launch of 1.1 (just to the theme files?)
You should assume that the files in trunk will be modified more. Trunk is the bleeding edge. Changes are being made to those files daily–even the theme files.