Number of posts per page

[delmarva]

I have 3.6.5. I just reduced the number of posts per page from 30 to 15 and it is not showing the change. I have tried updating the counters.

What is the procedure when making this change?

Thanks

MySQL Error  : Got a packet bigger than 'max_allowed_packet' bytes
Error Number : 1153
Date         : Monday, May 7th 2007 @ 06:18:34 AM
Script       : http://www.atlanticanglers.com/forum/admincp/misc.php?do=buildpostcache&startat=28001&pp=1000
Referrer     : http://www.atlanticanglers.com/forum/admincp/misc.php?do=buildpostcache&startat=27001&pp=1000
IP Address   : 1.2.3.4
Username     : Sam
Classname    : vB_Database

While trying to rebuild post cache.