Just noticed in DF 3.3 the preview functionality with multiple spreadsheets open and grouping active doesn't work very well with Excel 2010 and the DF taskbar.

Clicking a preview brings Excel to the foreground but doesn't change the visible workbook. Hovering over the preview and moving between preview panes causes Excel to blink and the preview panes to go blank.

This is with Show All Windows in the Taskbar enabled in Excel options.

The fix for this functions great, but the preview shows some type of black bar at the top of the active spreadsheet when Excel is fullscreen. When Excel is not fullscreen, the different preview windows have differing amounts of black borders around them. The Windows 7 previews never show this black area.

Also, opening the preview and moving the mouse outside the preview is causing Excel to flash (redraws the visible spreadsheet) which Windows 7 does not.

With three spreadsheets open, DF is drawing the three preview Windows differing sizes, and sometimes the sizes are in different orders.

Moving Excel from one monitor to another causes the spreadsheets to re-order when the MultiMonitor Taskbar is enabled - the preview window order changes so the current spreadsheet is last, but doesn't happen without the MMT.