This is Norton bug. The database freeze is not correlated with database size. Norton freezes even empty database.

I have reported this issue to Norton support but I don't think it will do much good. As Greg pointed out, if it does not hurt their business, they simply don't care.

Since Norton is pre-installed on many new PCs, it is a big problem for OrangeCD public image. It's impossible to tell for the end user what is the real cause of the app freeze, so everybody thinks OrangeCD is to blame.

As of today, the only solution is to exclude OrangeCD database folders from Norton real-time scan. If you care, please post about the problem on Norton forums as some people did already - hopefully Symantec will notice reoccurrence and fix their bug.