Be sure you have selected the right camera node (it turns from red to green when selected).
If you're prompted with empty boxes when you press F5, it's because no node is selected :)
Sometimes selecting the first (original) camera node won't work properly, try to reboot level editor (after saving

[1. Steam name?]

Hello


1. Steam name?
Kawobi

2. Maker or Tester? (can be both)
Maker first but tester too of course

3. Projects finished?
My showcase : http://supermeatboy.com/forum/index.php/topic,1845.0.html

4. Projects working on?
After training myself on simple levels, I'm actually working on a full chapter (yes like everyone else i guess  )

5. Time making levels per week?
Since 2 weeks, around 1-2h a day, more during weekend

Maybe you used Shift to scale your objects instead of Ctrl