Fullscreen/Seamless on Second Monitor

[tomf]

I have 2 displays: laptop @ 1600x900, external @ 1680x1050

When I put a VirtualBox (Win 7 guest) into fullscreen or seamless mode on my first monitor (laptop), it works correctly.
When I do this on the second monitor, it only expands the guest to 1600x900 and not the entire 1680x1050 screen.
The windows guest sees this (1600x900) as its maximum resolution so I cannot manually increase it from there.

I used to do this a lot, and it has worked in the past. The most recent update I have made seems to have broken this functionality. I recently updated to 4.0, but I'm not sure what version I had prior to that. I believe it was 3.2.something.

When in windowed mode I can actually resize the guest to larger than 1600x900, but when I then hit Host+L or Host+F it scales it back down to 1600x900.

[tomf]

upgraded my 4.0.0 to 4.0.2 with no change in behavior (still broken as compared to 3.2)

anyone else use a similar setup and notice this?
is there a place to submit bug reports?

[tomf]

If anyone else ends up reading this the solution is here:
http://forums.virtualbox.org/viewtopic.php?f=6&t=31695

somehow I didn't come across that forum post when searching