Thank you, I thought it was a more global issue
This is what mine looks like
Q: how did it get there?
<keybind key="A-S-Tab">
<action name="PreviousWindow"/>
</keybind>
<keybind key="C-A-Tab">
<action name="NextWindow">
<panels>yes</panels>
<desktop>yes</desktop>
</action>
</keybind>
but neither of those keys work as described
I installed alttab
this is what I got
% alttab
Error while (un)grabbing key 0x17 with mask 0x9/0x12.
Probably other program already grabbed this combination.
Check: xdotool keydown alt+Tab; xdotool key XF86LogGrabInfo; xdotool keyup Tab; sleep 1; xdotool keyup alt; tail /var/log/Xorg.0.log
Or try Ctrl-Tab instead of Alt-Tab: alttab -mm 4 -mk 0xffe3
and this is what I got:
% xdotool keydown alt+Tab; xdotool key XF86LogGrabInfo; xdotool keyup Tab; sleep 1; xdotool keyup alt; tail /var/log/Xorg.0.log
[ 6456.423] core event mask 0x3
[ 6456.423] owner-events true, kb 1 ptr 1, confine 0x0, cursor 0x0
...
...
[ 6456.424] Printing all registered grabs of client pid 5356 xdotool key XF86LogGrabInfo
[ 6456.424] End list of registered passive grabs
thay xdotool command for next window refuses to accept alt+tab