Hi Colin, I had these problems several editions ago, then it got fixed. But sure enough, it's happening again in 2.1.4.

In paper mode, highlight the troublesome fixture then click on the red spanner - if the label has already gone off the edge of the window, nothing may happen when you click the spanner, so you'll need to zoom out until the whole red box is now within the view. On the pop-up menu, select "Reset Transformation". That will put the symbol back to how it was, but more importantly, it should behave itself from now on.

If you're getting this problem with lots of fixtures, you can select all of them in one go, then you can do the "Reset Transformation" to all of them in one go. Hope that helps.

Only just discovered it myself after reading your post, otherwise i would have e-mailed the Captrue guys.

Robert