JFileChooser on OS X may revert to previous directory upon changing file format.

1. Go to `File > Open…`.
2. Browse to some directory that does not have any IDV files (ISL, bundles, or JNLP).
3. Pick either the ISL, bundle, or JNLP file format.

I end up in the parent directory of the last directory I opened. Note that if you pick `All Files`, everything seems to work as expected.