I know this is jumping the gun a little here, but I've run into a memory exception generated via the Edit Stage view in Continua within IE 11 on Windows 8.1 (Blue). Debugging indicates some sort of java script memory problem. DOH! Not sure how to interpreted this as I went into VS 2013 debugging to look at what's going on and it wasn't very helpful.
Can you post details of the error message? Is it reproducible? If so what are the steps to reproduce? If its a JavaScript error you’ll probably get more information using the IE development tools e.g. by pressing F12.
I’ve done a simple test here with IE11 and can edit actions and save stages OK for our largest configuration.