somehow I switched the setting for selecting some frame in the timeline. I was used to click once and have one frame selected. Now it selects the whole time of a keyframe when I click on it not just the frame I clicked on.
Any Ideas what I have done and how I can set it back how it was?
See if this fixes it:
Select Edit -> Preferences -> General
In the Timeline section uncheck the option for span based selection.
Also, you should be able to right click to select infividual frames still.
It looked like the 'free transform' tool was set even if I click on another tool. Something odd with the broken user interface.
So I restarted Flash and everything was ok again.