Printer Shares stopped working

[Biker]

We have several PC's that share out their locally attached printers. As of the start of this week the PC's that attach to these Shared printers can nolonger see the printers, but the PC's that are locally attached to the printers print ok.
When you try to browse for the Printer in the add printer wizard it lists the PC, but when you click on the + symbol to show the printer no printer is shown.

Its driving me nuts

Steve

[MYK-IT]

Many possible reasons....

Security permissions
Share permissions - is the share hidden?
Any recent changes to logon scripts? - A new / modified logon script, GPO or GPP?
Printer Spooler running on the computers?