I just tried it again and now the virtual visit is working both for full screen and windowed. Go figure. I hadn't done anything to it.
Now that you told me about the java webstart version not running SH3d with Java 7 update 2, I'm going to try it out for the fun of it. :)
ok, I just tried it out and it ran without problems. I did come across this dialog box about file associations or something. See my attached screenshot. I just said "yes" to the questions a few times. Otherwise it ran fine, and with the webstart version, I was even able to open a test home.
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sh3dvsjws7u2.jpg
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(Opening SH3D 3.4 with JavaWS using Java 7 Update 2)