By definition, nightly builds always carry stability risks, and that is likely to be more true than usual over the coming weeks; Joel has warned us that he is doing things 'under the hood' of Eraser, and some things may well break and need fixing as a result. Certainly that has been my experience over the last few days.
However, I have been testing build 2442 over the last day or so, and the breakages identified so far appear to have been fixed. Everything I have tested has worked, but I have yet to test the secure move functionality in this build. This was working in earlier (no longer available) builds, so I suggest you try 2442. Note that this will download and install .NET 4 Extended if it is not already on your machine, and that any problems you have with beta builds should be reported in the Beta forum.
David