We use the latest Win10.

Thanks for your kind words.

File contents macro does not insert a file. It reads and inserts the file content - the supported formats are non formatted text, html, rtf and image files.

Can you post the command example?

MouseMove command has issues in certain multi-monitor configurations. Try changing it with
The first number is the X-coordinate and the second is the Y-coordinate.

Double-click on a macro field and edit it.

Strange. Do you use another similar software or a clipboard manager? Can you try resetting the Clipboard Manager preferences to see if this helps?
Do you copy a very large content?

Please see the details here:
https://www.fastkeysautomation.com/version5.html

This is currently not possible. If needed, you could simply run the AutoHotkey script (Type: Run)...

Open your macro to set the actual setting and save it again. It should work.

There are several different Rich Text implementations in different applications and they may not be compatible. We recommend to use non-formatted text for regular text expansion.