I'm using Q2A 1.5 and now my site shows only blank page.
I've checket the Error Log and find out that there are more than 140 000 errors from 18 Feb to 22 Feb.
The errors are:
[18-Feb-2012 22:31:22] PHP Question2Answer MySQL query error 1030: Got error 28 from storage engine - Query: SHOW COLUMNS FROM qa_options
[22-Feb-2012 08:07:33] PHP Question2Answer MySQL query error 1286: Unknown table engine 'InnoDB' - Query: SHOW COLUMNS FROM qa_options
[22-Feb-2012 08:07:33] PHP Fatal error: Allowed memory size of 67108864 bytes exhausted
I've just emailed my hosting provider to check the disk space on their server. I'm using only 129 mb from 1Gig but it seems that they are overselling.