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This is most likely caused by the keyboard shortcuts in Fusion. Try disabling 'Hide Other Applications' in Fusion Preferences > Keyboard & Mouse > Fusion Shortcuts.
The reason this would affect Alt-Tab is that Hide Other shortcut uses the Option/Alt key, which causes Fusion to delay the key down event until another key is pressed. This is necessary to distinguish between different shortcuts that may be typed - we wouldn't want to send an Alt key down command to Windows if the user actually types AltCmdH for a Mac shortcut.
Thanks for the suggestion. I tried it today, and except for the very first Alt-Tab (Option-Tab) keypress, it seemed to work just fine. I'll try to access it at another time to see if it still works. For now, I'd say you've partially answered my question. Thanks again!
Update: I had occasion to try it again today, and everything worked just fine. You've completely answered my question.
Message was edited by: Rreini (updated info)
Deactivating the shortcut that used the Option key did the trick