The IDE doesn’t really work very well on IE on Win8.1. Clicking around seems to get interpreted as double-clicks or triple-clicks. (I’m using the mouse, not touch or anything unusual)
First click selects a word, second click a line, third click the whole document. Regardless of mouse moves or time between clicks!! Pretty serious issue.
This is a regression. It worked correctly about a month ago.
I think officially electricimp does not claim to support IE. You could try Chrome, firefox or safari.