Old print jobs are piling up on Windows clients

I just noticed something weird.

Printing from windows clients to Samba through cups works perfectly but 
old print jobs are piling up in the print queue for the printer on the 
client side.

I never had this problem with the clients when the server was running 
RedHat 6.2 with Samba 2.2.8 and LPD. The server has been replaced with a 
server running Tao 3.0.

I already checked my cups files and had delete print jobs enabled from the 
start, also when I log into cups I don't see any printjobs.

I appears as if the jobs themselves aren't there anymore, if I restart a 
job nothing happens. I guess it's just log lines that are kept in
/var/cache/samba/printing

Any ideas why this is happening and how I can stop this and clear the 
logs?

Googling around didn't get me anywhere but it must be a known problem, I 
noticed this on 2 servers already (the others do not print).

Thanks!!