UV issue with UV Editor - Frozen

I am using Blender 2.78 Have never had any issues UV unwrapping and then in the UV editor, scaling it
to fit the object … am working on a car… been working on learning how to model…
I am trying to put an image on a face of a cube… I did the Unwrap from Bounds and it displayed in
the UV Editor, but when I try to change the size, it is frozen, can’t select any of the verts … nothing… I’ve tried
closing the program and reopening and it will no longer allow me to do anything in the UV Editor…
Any idea what might be causing the issue that I can try to unfreeze it…
here is the file if it will help
this is the first time, I’ve had it freeze up like this… When I first went into it, the pointer had a circle and I could not do anything and couldn’t get rid of the circle on the pointer… finally got the circle to go away (not sure how) but now can’t do a thing and don’t know how to fix it…
thanks
Barbara

Attachments

1959 CHEVY IMPALA.blend (1.39 MB)

Okay… Never mind… I found my answer… I’ve been searching for answers online for about an hour… found it…
by mistake I guess I hit the Q and got this circle as a pointer, … I got rid of the circle, but the screen was still froze…
I found I had to hit the Q and get out of it… so now am able to scale my verts…

thanks
have a good evening