Hello Togijak,
Please have a look at this thread (it includes other issues, but the Java one is included as well).
http://forums.sandboxie.com/phpBB3/view ... 11&t=23893
When I tested this, the Java problem manifested outside Sandboxie as well. The user was able to, however, use the File---> Print option instead. Can you give it a try?
Can you also please try clearing Firefox's cache and test a new Sandbox?
Do you have any AV software installed, or Deep freeze?
Regards,
Barb.-