Just got WFX5 beta today. 
My reports.
Everything works fine with some exceptions:
1) Wobbly doesn't work at all, the window disappears for a while when I move it.
2) Start menu animations don't work, the start menu draws the user icon first then the start menu shows up without any transition.
3) Menu close animations don't work, none of them.
4) Window flip animation on middle click don't have any transition, I can see the info but the whole window doesn't draw.
Request: What about maximize and restore (from maximize) animations? I think a quick eased re sizing animation would look sooo neat.
Win7 Ultimate SP1
16gb RAM
Intel i7 2720QM 2.2ghz
AMD Radeon HD6750M
No fancy skinning, just plain aero, no transparency. Working transitions are really smooth, super good looking 
Objectdock plus 2 installed too
BTW: Guys (Stardock Team), since you're experts in windows GUI and Aero....how can you explain why Aero behaves so sluggish at times? is a common problem not everybody is able to spot, but some of us geeks can tell that the framerate drops from time to time.
I'm part of the FL studio beta core team and I can tell u, Gol (Didier, main programmer) is really pissed off by this.
Basically the whole Win7 GUI framerate varies constantly and is easily noticeable when using WFX transitions (no is not a WFX problem, is how Aero and the graphics card work together)
I was hoping to find some light about this subject because we are basically going crazy over the FL forums trying to find the cause, this happens in a whole variety of systems (mine is fairly new and the graphics card is quite fast)
Thanks!