I had the freeze up on 3.30.3 while updating my 2 mmp motors I bought last year using the link system. I was able to continually manipulate the freeze. I called castle and informed them. This was the first time I had updated these escs since I had initially bought them around a year ago. This all happened the day after I download and installed the 3.30.3 version on a windows 7 starter edition ASUS Netbook. I'm runing 2gb of memory so I dont think memory caused the freeze. I had even rebooted the Netbook several times thinking it was it and it wasn't I was able however to sucessfully write the software to the escs. I remember it had someting to do with trying to load one setting vs another.