Yep, sp1 is known to not work with Qt4 (not Qt's fault apparently). Don't use it and reinstall MSVC2005 _without_ the SP1.
Joost changed his dependency bundle to use SP1 and he seemed to be able to compile lyx with msvc/sp1. This was why I did the upgrade despite of previous reports. I will patch my msvc and report back. Cheers, Bo
