Try shutting the computer down completely, or if you have a ram cleaner, run it. Sometimes errors will stay resident in the ram and keep giving you headaches. If you know your way around DOS, you can try a RAM dump and see what errors are there, or look at the error TXT that Windows usually sends to the TEMP folder. And I'm not sure, but I think Sweet Home has it's own console that will tell you error messages, but I think that would be an Puybaret answer. I've never looked into Java console messages.
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