There is an incompatibility between PowerShare and Open Transport 1.1. It has to do with making synchronous versus asynchronous calls, and it is an issue with PowerShare. It is a periodic bug -- things might work for a while but inevitably, the system will hang. Also, there is not an easy fix. The code that makes the Open Transport incompatible calls is spread throughout PowerShare.
In short, PowerShare and Open Transport are not compatible. Apple has identified the problem, however, there is no known date when a fix will be available.
This article was published in the Information Alley on 1 Apr 1996.