Did something dumb which caused the 2400 to hang and need a power cycle.
I loaded a long file on A1 set a region (e.g. 0-1.5 seconds)
copied the file to A2(note did not slice, this was a copy operation), set a region (e.g. 2-3.5 seconds)
On pad A1 I went to Save-> Overwrite Same File
Tap Pad A2
I realize this was just bone headed, but maybe check to see if the truncate operation will affect any other pads?