Out of the blue, with really no explanation, our freestyle projects which use the 'Invoke Maven 3' began throwing the following error when attempting to invoke the Maven 3 step:

ERROR: Maven 'Maven3' doesn't have its home set
Finished: FAILURE

Where 'Maven3' is the name of the Maven installation configured to 'Install from Apache' version 3.0.4

Nothing in the logs to indicate a problem. I've deleted and re-added the Maven installation as well as creating new ones with different versions. Even went as far a blowing away the Tomcat context and redeploying still nothing.

Maven 2/3 projects still work fine.
Not completely convinced the Jenkins-Artifactory plugin doesn't have something to do with this; I have tested this issue in isolation, using only svn checkout and 'Invoke Maven 3', but wonder if the Artifactory plugin may be wrapping the job anyway.