There should not be any imcompatibilities between 1.0.1 and 1.0.0. There are a couple of changes that affect the behavior of Swarm, however. The big ones are:
The automatic dropping of probe displays upon the dropping of an object to which those probe displays were attached. This could break your application code if you leave in the
| dropProbeDisplaysFor: | 
The default probeMap has changed. This is only an issue when
| createProbeDisplayFor: |