Sketchup version 8 was released last week. There are some cool new features and performance enhancements, but there's also a new bug that will effect those of you who use the TF Rubies.
When creating shop drawings, I use feature called "raytest" to project the center of the peg holes from the side of the tenon to the side of the mortise. That feature is now broken, and the peg hole markings end up completely wrong.
I'll be looking into a work-around, but until then, or until Google releases a fix, don't use SU8 with the TF Rubies. If you install sketchup 8, your old version of sketchup will be left intact on your system, so you can use either one.