I have a ten Macintosh LC 520 computers running At Ease 2.0. Four StyleWriter II printers are connected directly to four of the LC 520 computers and they print fine. Other users trying to print (to a StyleWriter II) through GrayShare software, version 1.0 cannot find the printer in the Chooser.
If I turn off At Ease 2.0, and startup into the Finder, remote users can print to the StyleWriter II with GrayShare just fine.
Install version 1.1 or later of Printer Share (GrayShare's system extension), and everything should work fine.
Apple was able to reproduce the problem and determined that it's a problem with the 1.0 version of Printer Share.