For some reason avast doesn't like it when snagging the image of the firefox alert, why I don't know, it didn't used to do that with earlier avast versions.
Snagit 9.1, 1Click, Active Window
an absolute doddle.
I haven't been tempted with the upgrade to version 10, I think $24.95 (I think is too much for an update). There is still so much that I don't use in 9.1 I could probably stuck with snagit 6 which I think I started off with.