Visual glitches in Spaces

If I use the arrow-key shortcut (no matter how they are setup in Systems Preferences) whilst holding an App's title-bar, to switch it between spaces, the HUD showing which Space the app has been moved to only shows up sporadically.

I've tried changing Spaces settings, turning it on and off, restarted etc. and it still does it.

If I use the number key shortcuts it displays fine now matter how quickly I move an app between spaces.

If I use the drag method it's also fine... but you can only do that slowly

If I use the titlebar & arrow keys method very slowly and wait for the HUD to fade out before switching to another space its fine. (i.e move from 1 to 2, HUD shows, wait until it fades out, then move it to space 4, HUD shows)

BUT... if i flick an app between spaces quickly the HUD only shows sporadically after the first switch. Sometimes the desktop image will flicker in front of everything for a fraction of a second.

I have an Alu MacBook and I can achieve these results after a restart with only the Finder running.

P.S I've posted this question elsewhere as well... so sorry if people have seen it in other places as well. I oughta make a little vid to show exactly what happens.

 

I made a video to show more effectively what I mean.

http://www.youtube.com/watch?v=Jq7NxNrl24s

As you can see the HUD doesn't display all the time. I'm not hopeful for (or expecting) a solution, although I don't remember it being like that before 10.5.7. But I'd just like to find out what you think of the bug and if anyone else can get the same results.

I do realise it is a very minor thing, albeit one that irritates me.