Recently upgraded to 2.3.4+ (20130214) from 2.2, and have been having a significant number of database related problems. Cron course backups never complete, unable to import content from some courses into others. Applied patch from MDL-37939, and after reading other forum postings, decided that upgrade to newer version would be best. Have updated all plugins to latest levels, all requirements are met, so tried to upgrade to 2.4.3. Click on Upgrade Moodle Database Now button and the process runs for about 30 minutes and then times out. Have also tried version 2.3.5, 2.3.6, and 2.4.2+, all with the same result. Being a relative newby to Moodle, I am not sure what direction to go next.
Environment - Windows 2008 R2 Server, MSSQL 2008 R2, PHP 5.3.8