Printer Unavailable Error

Hi eVeryone.

I've installed Corel Draw X6 64bit in my bussines enviroment with windows 2008 R2 and Ctirx Xenapp 6.5.

I have a printer server ( windows 2008 R2 ) that shares all of my printers ( about 10 ).

When I try to print from Corel on 4 specific printer I get the error " the printer is currently unavailable.

All applications can print on these printer and I cannot understand why Corel gives me this error!

Is there any way to troubleshoot this?

Thanks.