This is a Windows error, not a Mac error.

Load A_thaliana_Jun_2009
Click 'Sample BAM file' under IGB quickload >RNA-Seq in Data Sources panel
Zoom in and load
Rt click on Sample BAM filetrack label and everything looks fine
Preferences -> Tracks -> Change FG color of BAM file.
Color updates but when rt clicking on Sample BAM label again and rt click menu is half gone (attached photo) and the error below is thrown.

The same error is also thrown when:

• Any BG or FG color adjustment is made to any track from the 'Track List' table or from the 'Properties' sub panel. This also includes the coordinate track.
• If color is activated from the 'Show Strand' sub panel
• If the '+' or '-' colors are adjusted
• When any BG or FG color adjustment is made to the track default list and then 'Restore to default' is clicked
• Any BG or FG color adjustment is made to any track listed in the 'Data Management Table'
• Any color adjustment is made to 'Coordinates' colors, 'Residue Colors', 'ORF Analyzer' Colors, or 'Edge Match' color
• Any of the above adjustments made to local files (either desktop or URL) will also cause the error.

There is no error thrown if:

• Any size adjustment is made to any track from the 'Track List' or 'Properties' sub panels
• If arrow is checked under the 'Show Strand' sub panel
• Any BG or FG color adjustment made to any track listed from rt click -> change -> color DOES NOT throw an error.

Error trace attached as file (it is huge)