I have twice managed to damage DG while trying to import data from Matlab using the clipboard command. I had a 4096-by-1 column vector p in Matlab and put it in the clipboard via clipboard(‘copy’,p). Unfortunately, Matlab insists on sticking square brackets at the beginning and end of what it puts on the clipboard, and so when I pasted this into DG it put it all in one entry (as text, I guess). That gave me the spinning wheel of death, and it was difficult to get out of that (see this issue in Support). Next day I inadvertently did the same thing and killed DG again.
I got around the problem by writing the data to a csv file instead of using the clipboard function in Matlab.