These happen for one of the following reasons:
The network driver has not loaded. Under the Windows Setup program on the client, check the Network option to verify that the correct network driver has loaded.
For Windows for Workgroups and Windows 3.1, the UNIX spooler misinterprets a PostScript file. When you print a PostScript file, your client sends a "CTRL-D" as the first character. The UNIX spooler, which cannot handle this, stops the print process and deletes the spool file. To correct this, add the following command to the client's Windows win.ini file under the section header [PostScript Printer,LPT1:]:
CTRL-D=0:
In some DOS applications, print jobs do not send until the user exits the program, because the PC buffers the print job and does not spool it until the application closes.