When a secondary monitor is rotated 90 degrees into portrait mode, the resize function for the applets (i.e. hold Shift down and drag the edges) does not work properly.
I can drag the left/right edges of the applet to resize the applet width. However, when I try to grab the top/bottom edge to resize the height, the horizontal arrow is displayed, and the applet width is resized.
If I drag the applet to my primary monitor (landscape mode) it works as expected. It also works as expected when the primary monitor is in portrait mode, or if there is only a single display in portrait mode.
This is build 2771 on Windows Vista Enterprise Service Pack 2, 32bit.