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Sounds similar. Not quite the same as that is dealing with a plugin that is not necessarily in the classpath. Could be the same root cause if the IDE is merely locking all of those resources though.

Good call, I do have that setting enabled though.

Closing all of my other workspace projects didn't seem to have any effect.

I will try that. I know that I definitely have multiple projects referencing the same snapshot dependency. I know that b/c I have a plugin and a war that will both have the jar inside the Grails...

1) Create a SNAPSHOT jar project, install to local maven repo.
2) Create Grails plugin that depends on that jar.
3) Refresh dependencies on plugin
4) Install an update to the SNAPSHOT JAR.
5)...