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You are looking for two or more modifications that are causing the conflict over processing the keyboard events.
Uninstall everything, testing in-between each uninstall.
Install only one thing at a time, testing in-between each install.
The first uninstalled item that clears the problem is one of the conflicting items, the other one (or more) items are in the set of things not yet uninstalled.
The first installed item that results in the problem is one of the conflicting items, the other one (or more) items are in the set of things just installed.
Now you have identified one of the two (or more) conflicting installs.
And a (hopefully smaller) set of things that include what it conflicts with.
Revert to a "virgin" system (one without anything extra installed) -
Install the single item identified above, re-test.
Does the problem re-occur? Yes: that item conflicts with the system, No: that item conflicts with the identified small set of other items.
With the one identified item installed, and the trials limited to the smaller set of items; repeat the above.
Keep good notes, let us know what you find out.
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