Version 5.965
It happened to me already two times that suddenly in Reaper all volume fader are down and the meter height is set to maximum for all tracks. Last time restarting brought back the old settings, but know it doesn't work.
Is there a way to adjust the height of all meters at the same time? (edit: Found it:holding Ctrl)
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Working with 5.962 now to see if this happens also ...