I'm having a bit of an issue, with dimensions in sketches, more of an annoyance than anything.

Today, a few times when I've try to dimension a sketch, whether it be editing an old sketch or dimensioning a new sketch, the dimensions won't place right, or will flat out disappear, as shown in the screen cap below.  the worst parts are when I'm trying to change a dimension, and it doesn't place it where I want it to.  It usually places it quite some distance from my mouse cursor.  In the second picture below, I had placed the mouse cursor quite a bit farther to the left of the line dimensioning the circle, and the same thing happened when dimensioning the separation between the circles.  Even after inputting a dimension, the dimension doesn't show up. 

I haven't changed any settings regarding dimensions (that I know of), and it doesn't happen with a different file, even when they're both open at the same time.  The other file, the dimension gets placed right where the cursor is, and it shows up after it's placed.  It also happens whether I use smart dimension or not, so that doesn't seem to be the problem.

Any help you can provide will be appreciated, and I hope I explained what I mean good enough