I've discovered that it's a problem of VMWare Workstation version 7.0 - the devg-vmware driver doesn't work any more. This goes for QNX 6.2, 6.3, 6.4 - all of them.

My solution for 6.4 is the following:
- open /etc/system/enum/devices/graphics
- find the line where it says "-d vmware"
- add " -d vesabios " just before the above
- reboot
- choose vesabios when it asks for the graphics mode.

Solution for 6.2:
- open the display configuration
- click "Advanced"
- instead of "devg-vmware.so" write "devg-vesabios.so"
- Apply