Trouble opening Jar from USB stick on a Mac

Hi all,
Has anyone else had any problems running Jar files from a USB stick on a Mac -- directly clicking on them in the finder?
What I've found:
- I cannot run any Jar file I try if it is on a USB stick and I double-click on the jar file in my Mac
- I CAN run jar files from a CD by double-clicking
- I CAN run jar files from USB sticks on Windows directly from the window
- I CAN run jar files from a USB stick on a mac if I call "java -jar" directly from the terminal
I have tried running from USB sticks on several different Macs, and I've tried a number of different Jars that I've created over the years -- nothing works. The Java code isn't doing any path-based finding of files or anything like that.
Anyone else tried this? Are there any solutions?
Thanks,
Sam

Try this:
With the stick plugged in, go to Finder->Applications->Utilities->Disk Utility.  From there, you should see your memory stick appear in a sidebar on the left.  Click on it, then click on the "erase" tab and follow the instructions.

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