Up arrow toggles window shadow decoration

[Gene Smith]

On 08/02/2015 02:42 PM, Gene Smith wrote:
> Recently I started having a problem with the main "up arrow" key in that
> it stopped working in f21 kde. When pressed it now just toggles the
> window shadow/highlight on/off of the current window and does not have
> the expected scrolling effect. The other main arrow keys work as
> expected. (The arrow keys in the numerical keypad still work as expected.)
>
> The main up arrow key works as expected in a terminal (e.g., after
> pressing ctrl-alt-f2 and logging in).
>
> The kde setting for keyboard had not been touched and was at default 101
> key keyboard. Tried a few other layouts there but it did not affect the
> problem.
>
> Any ideas on how I can fix this?

Short-cut "kwin / Suspend Compositing" under "global keyboard shortcuts" 
was set to "Up" instead of default "Alt-shift-f12". Apparently under 
"desktop effects" I accidentally changed the short-cut to "Up" (which 
will occur with no confirmation by clicking "apply").