I'm using ArcGis 3.10. When a user uses the mouse to pan, occasionally they get stuck in a mode where, after releasing the mouse button, further mouse movement continues to pan. It seems the mouseup or dragend event is somehow missed.
Are others seeing this? Is there a solution? I did see a post with this problem using Silver-light.
Take a look at this discussion, which talks about event propagation issues.
This problem is fairly easy to reproduce using one of the samples:
https://developers.arcgis.com/javascript/jssamples/fl_hover.html
It seems to happen with IE more so than Chrome or Firefox.