Unfortunately the 3.0.8 was not the best release ever of the GPD. The good news is that 3.0.9 is on its way, hopefully a lot stabler...
If you like you can build it from the sources by checking out the jbpm.dist project and running the ant dist target on the build file. Beware, this will build the entire starter's kit for the upcoming jBPM 3.0.3 release which will include gpd 3.0.9. It will download all necessary Eclipse drivers, so it may take a while. You'll also probably need to adjust your jboss.home property in the properties file.
Is there an anticipated release date for that stuff? I am eagerly awaiting an update to the plugin as well. Thanks.
It should be next week sometime a presume... I am currently doing some minor corrections. Then we will do a QA cycle...