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I am not sure if this happens with other style options, but it is consistently happening with the mark-occurrences style. Steps to reproduce: Download python module for netbeans from module selection dialogue. Download extra themes from plugin module selection dialogue. Choose "Ruby Dark Pastels" as style profile (Tools->Options). Duplicate profile, rename to "Ruby Dark Pastels - 2" Customize mark-occurrences background style of Python language. Click 'OK' Test style on code (it works). Close Netbeans, re-open Netbeans. Error manifestation: Style reverted back to previous setting. Note: Full user read/write permissions given to directory. Other styles save on change and reload of IDE.
*** This bug has been marked as a duplicate of bug 157174 ***