Accounting stopped

Hi All, Since a power cut last Sunday FreeRadius has stopped writing to its log files and updating radacct in MySQL. It is continuing to authenticate users. It gives no error messages running radiusd -X. I've tried upgrading from 1.0.3 to 1.1.3 with no effect. I've been working round the clock for five days now and seem no closer to a solution. Any hints, tips or advice would be very welcome. Regards, Sean -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.