On 17/03/2019 11:24, Paul wrote:

J. P. Gilliver (John) wrote:

It showed exactly the same keypresses for "(" (shift-9) as for ")"
(shift-0), other than of course one had the 9 key and one the 0 key.
But I did notice that all the time it showed left Ctrl as pressed.
Weird thing is that actually tapping left ctrl had an effect (for
example: I have the Windows built-in utility on that draws circles
round the mouse cursor to help you find it if you tap either ctrl key,
and tapping the left [or right] ctrl key still makes the rings
appear), so it doesn't seem that the key is _actually_ stuck.

Tapping the left ctrl key a few times eventually made its
"pressedness" disappear from KeyBoardStateView - and hey presto, I
could then type ")" again!

This sounds like an Accessibility Feature.

One that "stretches" actuation of modifier keys,
so a disabled person can be just as productive
as everyone else.

In other words, *some* operation you are inadvertently
typing, keeps the "control" "jammed" for a period of
time, or until enough key presses have occurred to
cancel it.

Yes, I'd agree. The thread has got so long and convoluted that I can't
remember what JPG has already tried, but he might like to go into
Control Panel, Ease of Access to see if there's anything enabled there
that doesn't need to be - particularly Make the Keyboard Easier To
Use, Turn on Sticky Keys if enabled would be the first thing I'd turn off.