CYC + 2.8 + Pruning + register = error
Using v2.8 (latest) with Customise Your Community and get this error when trying to register:
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/path/to/classipress/header.php on line 42
Line 42 is while ($row=mysql_fetch_array($sql)){ which is part of the 'pruning' code.
Setting 'Prune ads' to No, removes this error.
Also, using CYC with the default theme also produces no error, without or without pruning.
So ... Using CYC with 2.8 gives an error IF you have pruning set to yes.