The AppleShare 2.0 client (ie System 6 and earlier Macs) bombs when connecting to a volume of about 30GB, from memory. The volume will be displayed in the Chooser, but on connection the Mac will crash. It all worked well for me before I increased my AppleShare volume to 80GB.
** Lots of testing needs to be done. I don't know whether the crash is caused by total volume size or by free space.