Hit a mystery key - how to reverse it?

Still learning FCP (5.1.4) with some success. Yesterday, I must have accidentlally hit the wrong key or menu combination, because this happened:

1. could no longer drag and drop clips to the viewer, but I could double-click them in.
2. inserting a clip to the sequence timeline moved the scrubber and left a gap but did not display the clip until I clicked in the area.
3. Timeline scrolling was very slow, while adjusting the slider, etc.
4. could not drag and drop or insert any transitions
5. closed FCP and reopened project, and all these things went away.

just would like to know what I inadvertently did so I can fix it w/o closing/opening.
 
Sounds almost like what sometimes happens when you hit command-option-W to display the audio waveforms. While the waveforms are being calculated, many timeline-related operations grind to a halt!
 
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