If I select an item in the Media Explorer, it is highlighted and its waveform is displayed.
If I then select, say, another track by clicking the TCP, the highlighting changes to the "Window list selected row (inactive)" colour and the waveform remains displayed.
But if switch to another program (e.g. Firefox), the highlighting changes to the "Window list selected row (inactive)" colour and the waveform is not displayed. Even when I switch back to Reaper.
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https://i.imgur.com/ApFDTJh.png