JPCSP can't load anything.

[gid15]

The problem is not due to the iso file. At least I don't think. Like I said, the cube files don't play which means the problem is related to my PC/Set up.

Could you post a log file at INFO level?

If the log file (log.html) is still empty, you can try to start Jpcsp, set the log level to DEBUG, load the cubo demo (Load UMD), press run and post the generated log file (this time, there should be something in the log).