I followed the guide for blank screen to see if that was it, but no - the design is screwed so i changed the debug log to level 15, and it shows:

[22-Feb-2007 16:19:10] PHP Warning: preg_split() [<a href='function.preg-split'>function.preg-split</a>]: Compilation failed: lookbehind assertion is not fi xed length at offset 7 in /usr/local/www/roundcube/program/lib/DB/common.php on line 751 [22-Feb-2007 16:19:10] PHP Warning: Invalid argument supplied for foreach() in /usr/local/www/roundcube/program/lib/DB/common.php on line 756 [22-Feb-2007 16:19:10 +0100] DB Error: DB Error: mismatch Query: [DB Error: mismatch] in /usr/local/www/roundcube/program/include/rcube_db.inc on line 501 [22-Feb-2007 16:19:10] PHP Fatal error: Call to a member function fetchRow() on a non-object in /usr/local/www/roundcube/program/include/rcube_db.inc on lin e 368