I found a very serious bug in ST3, most recent update.
I opened a large binary file (125mb) - ST correctly opens it in hex mode. I accidentally inserted a space in the beginning, but I removed it. Without thinking too much about it, I saved the file (which took almost a minute on a fast machine with ssd, but that's not the real issue.)
So I saved the file, with no actual changes.
BUT NOW IT IS CORRUPT!
128 712 704 byte
128 708 608 byte
I was able to reproduce this.
Thank goodness I had a backup...
I am on Windows 8.1