While using Web Studio, the (right-click) context menu in the Site Explorer pane will sometimes act strangely.
Using Firefox 2.0.0.4 for Windows XP SP2 with the "Disable or replace context menu" javascript option disabled, right click on a node in the site explorer. Once the context menu has shown, right click again. The menu will vanish - this is incorrect behavior. A subsequent right-click on the same node should re-open the same context menu, not cause it to vanish.
Once the menu has vanished once by right-clicking while it has opened, right click on any other node. The menu is now corrupt and immediately vanishes after fading in. Additional rapid right clicks can further corrupt the context menu, causing it to only fade in at a partial opacity or never display at all.