Hi,
I have the same problem as Lindbert. I've found that snapping with media player classic or other players is fine, but in WMP12 it won't snap correctly. Snapping to the top of the screen does maximise the window, but dragging the window back down it does not revert to its previous size. In other words you have a full screen WMP window, that is not technically 'maximised'.
When snapping to the left side of the screen, it sticks to the top left corner but will not resize the window to fill that half of the screen, so small windows remain small and large windows remain large. The same happens when snapping to the right side of the screen, but the top left corner of the WMP window sticks to the top and exact center of the monitor. So it looks like it's attempting to fill the right side of the screen, but again the window does not resize. This means if the width of the WMP video was less than 1/2 the width of the screen, it wont fill that half, and if the width was larger than 1/2 the width of the screen, it will 'run off' the edge of the screen causing the cut-off that Lindbert mentioned.
Would love a resolution to this, other than switching video programs.
If it makes any difference, im using:
WMP 12.0.7601.17514
Win 7 Ultimate -64 bit v. 6.1.7601 with service pack 1