Sometimes you just want to let out a yell. I've been using a tool for the first time in ages and you forget how painful it is. Particularly as the tool is a nightmare to work with at times.

Pressing delete on a diagram really means delete when all I want it to do is remove the box from the diagram...And this "feature" has put me back on quite a few occasions.

It reminds me of the editor we used to use called VI which I used on Sun Solaris. It was a nightmare to learn it's features, however once mastered it was a joy to use.