GW8 client might not attach files or documents. GW8 would hang up or crash (Not responding) in WXPP.
This might be related to the Xerox Phaser printer driver. This situation happened with the Xerox Phaser 8560 (Web-based PostScript Print Driver Installer, Version: 5.58.10 Date: 3/27/2008 Size: 2.8MB Language: English (US). Web-based PostScript driver installer for the Phaser 8560. Microsoft WHQL Certified. Citrix Ready) was installed as a default printer in WXPP.

As soon as the printer driver was changed to the regular Xerox PostScript ( PostScript Driver, Version: 5.58.10 Date: 3/27/2008 Size: 5.5MB Language: English (US) Win2000/XP/03/08/Vista/Win7 PostScript driver. This driver uses the Add Printer Wizard and offers full support of the printer specific features for the Xerox Phaser 8560. Microsoft WHQL Certified.driver), the problem disappeared.

Uninstalled the Xerox Web based PostScript printer driver and installed the regular Xerox PostScript printer driver. This seems to resolve the problem.