If possible, can you make a screenshot to better demonstrate what you are seeing?

My advice would be to experiment moving the individual corners of the face along an axis that makes it coplanar with the other corners. You do this by hovering the Move tool over a corner (and as long as you currently have no selection) clicking on that point and moving it along the proper axis. Good luck!

Hi I'd quickly like to introduce myself. I am a user of SketchUp Pro/Google Earth at the SketchUp office in Boulder. I have been building georeferenced models for GE for a little over a year and a half, and have been very much enjoying it.

I hope to be an active member of the SCF and contribute some knowledge, and probably find out a thing or two from you all. Thanks for creating such a useful and creative forums!

See you around,
Zach