If a particular window does not appear after selecting it, another somewhat less intrusive solution is to select Window from the main bar at the top of Timeslips. If the name of the window you tried to open is listed there, and typically with a checkmark next to it indicating it is the window being displayed, just click Cascade right there and the window will appear on screen. The setting inside preferences indicating the X-Y coordinate position of the window can become corrupted and the window appear either 1 pixel square, or positioned outside the positions on your monitor. Sometimes downsizing from a 2-monitor setup can cause it as well.
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