I'm currently having a similar issue to your third one with my VWM. However mine only moves down a screen or two, and it is only when I have no windows displayed on my desktop (ie: minimized, or no windows running at all).

I'm using RabidVWM-1.01.... I'm not sure if that is the latest version... checking now...nope.... latest is v1.1.1... installing now.... so far so good! I'll have to close this window to be sure tho....

EDIT: Yeah, as far as I can tell that fixed my problem. Keep in mind I am using a custom theme, not Glaze.