Substance L&F seems to break when deployed as webstart in java

I think I am having a weird problem:

I 've written a small application in java implementing a JTable to display some results. I am also using the Substance L&F as my "skin". Everything seems to be working perfectly.

When I upload the app on my server as webstart, strange things start to happen:

At some point my app generates a little JTable. Every time I mouse over that table, the app's JButtons or menus or any swing control in general will stop responding. My only option is to close the window and restart the application. Note that the interface seems not to be frozen but like it's lost its focus... if I try to click in any of the table's cells, the UI will still be responsive (not on the swing controls though).

If I get rid of Substance, the problem goes off and everything is working normally again. If I use another "skin" like JTattoo everything works flawlessly as well.

This only happens when I use the webstart. Does anybody know why..?

or better 开发者_运维问答has any hints on how to fix it?