There’s a new E17 snapshot up, which I suggest everyone update to immediately because it’s new and shiny and I said so.
This was a frustrating bug in the sense that it should not have happened. Apparently when changing clips on an object we send mouse movement events. This caused the menu to try activating two menu items at once, which broke everything.
I spent most of the day implementing the XDS specification in EFM. What this means is that it is now possible to drag files into EFM windows from nearly any application.