Try to set screenpercentage to 100 via the following console command: 'scale set screenpercentage 100'. If the issue is gone then this is a known issue that is already fixed in our codebase (will be in the next release of OUDK).
That command fixed it 100%! thank you guys for figuring this out ^_^ ... in the meantime, should i do a PostBeginPlay in my Game class for this to keep it fixed till the new release of the OUDK??