This bug report looks like a duplicate of #621464. Again this might be related to a dual monitor setup and a bug in java3d. So sweethome3d might only be affected by it. If anyone still encounters this issue, please report back. I could provide a patched version of java3d, thanks to [1], that may resolve this bug.
Markus [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=621464#64
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