Well Nomachine's tech support did eventually get back to me with some suggestions. By that time though, I'd reinstalled Debian on the problem server. In doing so I discovered that at least part of the problem was that in /etc/profile I had 'export DISPLAY=:0' which was causing a misdirect. This was not the cause of the login reset, but it fixed my blank screen problem after I reinstalled. It's running fine so far.
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