Comment 3 for bug 728428

it happened again just a few minutes ago.

I mostly move between workspaces with the keyboard. I know where my apps are, both globally and relative to each other.
As I said, I have 6 workspaces in line. no grid, just a line. My compiz has:

===
[core]
s0_click_to_focus = false
s0_raise_on_click = false
s0_autoraise = false
s0_raise_window_key = <Control>Up
s0_lower_window_key = <Control>Down

[rotate]
s0_rotate_left_key = <Control>Left
s0_rotate_right_key = <Control>Right
s0_rotate_left_window_key = Disabled
s0_rotate_right_window_key = Disabled

[wall]
s0_slide_duration = 0.000000
s0_left_key = <Control>Left
s0_right_key = <Control>Right
s0_left_window_key = Disabled
s0_right_window_key = Disabled
===

It seems it happens when I hit Ctrl + left or Ctrl + right too fast (repeat mode, just keep the 2 keys pressed). At least I can reproduce it easily that way. I guess it occurs frequently for me because of my 6x1 line. With the default 2x2 grid, there's no point in repeating the action.

(I use a full size keyboard, Ctrl with the left hand, and the arrows with right hand, very handy to swiftly move between workspaces when I work, no need to touch the mouse)