The problem occurs when a server has first had EtherTalk 2.0, installed, then
later has had EtherTalk 1.0 or 1.2 installed. AppleTalk driver version 53 --
which is installed with EtherTalk 2.0 -- does not work with earlier versions of
the EtherTalk driver.
When switching from EtherTalk 2.0 to EtherTalk 1.0 or 1.2, AppleTalk driver v53
must be removed from the System Folder and replaced with AppleTalk driver
version 52, which works with EtherTalk 1.0 and 1.2.
The removal must be done manually, by dragging the AppleTalk driver icon from
the folder. Installing the new version can be done either with a Finder copy,
or through the EtherTalk 1.0 Installer.