First of all, awesome plugin!
The only problem I'm experiencing is when I try to zoom into the map by double clicking on it (both normal maps and mashup) - the first time I double click in order to zoom in it works as expected. But if I try to zoom in again, the first click makes the map zoom out! This means that after zooming in once, if you try to zoom in again by double-clicking, the first click will make it zoom out, and the second click won't have any effect.
This is not a serious problem for normal maps which usually have few markers, but for a mashup map where you probably start viewing an entire city and want to zoom in to see the location of a specific marker, it can get quite furstrating (you are forced to use the ± buttons).