This is a very small problem, but has been exacerbated by having it occur multiple times. It's 100% reproducable, and I'm calling it a bug because it doesn't seem to have any intended purpose or function.
In the Edit UVW's window, there's a small coordinate box on the bottom left which can be used to Set coordinates or Displace coordinates, which is very useful if you don't want to use the snap tool.
The Bug is that if your mouse cursor is moved into the main viewport of the Edit UVW window after having clicked into this Displace Coordinate field, then your inputs will no longer go into the Displace Coordinate text box, and will now be fed to the Edit UVW's viewport instead.
Usually how this ends up happening is as follows:
1. Move mouse to the Displace Coordinate field and click to input. (mouse is now on bottom left of mousepad, very close to numpad)
2. Move mouse (without clicking) away from Numpad to type coordinates.
3. Mouse moves into the Edit UVWs window and stops input to Displace Coordinate field.
4. Numbers are now shortcuts to different commands instead of typing numbers, and Enter will flatten your UVW's.
5. Congratulations, now you need to undo a few times and begin the process anew. I don't think this is an intended feature.
