The Version table provides details related to the release that this issue/RFE will be addressed.
Unresolved : Release in which this issue/RFE will be addressed. Resolved: Release in which this issue/RFE has been resolved. Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
EVALUATION
5.0u12 backport for 6432397 [Windows l&f on Vista JComboBox does not look like native] does not introduce this bug. Closing as "not reproducible"