There are a number of issues all related to getting the correct rotation of Nimbus painted graphics. This issues are issues with the RTL painting of many components and the issues of Tabs when they are at the LEFT,RIGHT or BOTTOM. See Below for more detailed deciriptions of each of these issues:

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Nimbus L&F: JTabbedPane Tabs appear incorrectly when placed at the bottom.

This is observed on Nimbus L&F all OS with the current 6u4b02 pit build.
Please refer to the screen shot attached for seeing this issue.
The tabs placed at the bottom appear exactly the way they appear when they are placed at the top.
The tabs should end at the bottom and the tabs should be attached to it from below.
The tabs are not attached to the tabbed pane from the "top" as they should be in the bottom placement.
In the attached image, continuous line below the tabs should actually appear above the tabs.

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Nimbus L&F: Scroll Bar - RTL Orientation not rendered properly

See bug 6605140 for more details

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NimbusLAF:JComboBox issues with RTL orientation.

See bug 6594753 for more details

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6605426 Nimbus L&F: White vertical border is seen in JProgress when it is set to Right to Left orie

See bug 6605426 for more details

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Nimbus L&F: in RTL arrow button & textfield in JCombobox need flipping

See bug 6605477 for more details

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Nimbus L&F : Arrow button is moved towards right in when JComboBox is RTL orientation

See bug 6607567 for more details

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Nimbus L&F: JSpinner - Rendering of arrows in RTL orientation needs fliping

See bug 6623961 for more details

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Nimbus L&F: JToolBar grip icon needs flipping for horizontal RTL toolbars

This has no other bug for it.

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Nimbus LAF : JSlider inside the JColorchooser is incorrect (slanted towards right side 2 to 3 pixel)

In JColorchooser on the HSB tab it has a special Slider that has a arrrow thumb in stread of the usual round one. This was painting so that it was pointing in the wrong direction. Also it was not painting in the MouseOver,Pressed or Focused states.

See bug 6594743 for more details
Deleted Incorrect Entry.