Hi,
I'm currently battling the same issue with VPB. But with a much higher 
resolution data set , in the order of 12.5cm res terrain and 4cm imagery. When 
viewed in other 3d software under WGS84 projection the terrain and aerials line 
up 100% - however once passed through to VPBmaster the terrain and aerials have 
some huge reprojection issues. The terrain has an offset of up to 1m in places 
horizontally - this is very apparent because the terrain is for a city scene 
and the footpaths have a 12.5cm vertical step in them. 
Along with the offset the terrain also no longer follows straight lines 
(typical curb line between two corners) - and meanders back and forth creating 
a jaggered edge. 
This has only just occured since we moved over to a Linux box so I'm wondering 
if the GDAL's are at fault - our programmers currently looking into it.
Sorry I couldn't be of more help , but you are not alone on this one.

Cheers,
Colin 

K2VI.com

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