yes, I can reproduce it, only on XP though... but you need to do exactly what the OP did in the video.... (and MessengerDiscovery has got nothing todo with this)
Preperation:
Start and sign in into Messenger
Set contact list transparency to anything other than opaque
(You can exit Messenger and reopen it again or whatever, this doesn't matter)
Way to reproduce:
1) Type something in the word wheel so that only a part of your contacts are showing (eg: in my example "pa"). Everything is still normal at this point.
2) Minimize the contactlist!
3) Click on its taskbar button or double click on its trayicon to open it up again
4) Continue typing in the word wheel so that even more contacts are filtered off (eg: in my example "pat" -screenshot-)
5) Voila... mess up...
Way to get things back to normal:
Any way which involves redrawing the whole contactlist window. So, simply clearing the word wheel at this point will not put things back to normal. What works is eg: closing Messenger and reopening it again from the systemtray icon, setting transparency to opaque again, applying a skin, ...
But also interesting maybe is the fact that, after you had the bug occuring, if you set the transparancy to opaque and you press "Apply", you can see the contactlist changing opacity but the bug is still visible (the window is not completely redrawn in this case I suppose?). Only after pressing "Ok" the contactlist is realy fixed (window is redrawn I suppose).
Having a skin or not does not have any influence on this. (at least the ones I've tested)
Windows XP SP3
Windows Live Messenger 2009 (14.0.8064.206)
Any version of Plus! since 4.80.xxxx, incl. betas.
(anything less doesn't seem to be 'compatible' for this WLM version)
With Windows Live Messenger 8.5, this bug does not occur.
With Windows Vista, this bug does not occur.
nothing is removed from the screenshot, I only pixelated the emails. The things being 'removed' is because of the bug