Hi Henry, how much system memory do you have on your computer?

The current v4 beta uses a different method to load the file which involves loading the entire file into memory to start with. That could be a problem if you have a very large file but not a corresponding large amount of system RAM to go along with it.

Is it possible for you to send me one of the files at moi@moi3d.com so I can test it over here? You'll need to use a file sharing service like dropbox or something and send a link to the file.

My guess about crashing the computer is that if you don't have a lot of system RAM you are probably running into virtual memory swapping which will grind everything to a halt.

I can probably detect if you don't have enough system RAM to use the new loading technique and revert to the previous method, but it would be good for me to know your system specs and get a test file to set that up.

Thanks, - Michael