This is a known issue that our Development team is currently looking into.
Behavior: When attempting to stop a recording from Camtasia after recording a Powerpoint or Keynote presentation (in presentation mode), will result in the Camtasia Recorder crashing or hanging.
This can also occur when switching to another application during presentation mode (for example, hitting Command+Tab to go to another window while presenting the Powerpoint).
Workaround: Once the presentation is over, completely exit out of Powerpoint or Keynote before stopping the recording in Camtasia. This should allow the recording to finish correctly.
*Note: This also applies to the TechSmith Relay Recorder on Mac.