Had the same problem today, and remembered this good old thread.
I found a not-really-difficult reason: I missed to create the standard zzsys* tables in my new application data base.
(These are provided by the "sample" application, or by the "vanilla.sql" file that can be downloaded as "Blank Site" here http://download.nubuilder.com/files/modules/vanilla.zip.)
There might still be 100 other reasons for a blank screen... I suggest the default scripts should complain somehow in that case - just to exclude that failure reason. (The apache error.log said nothing.)
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