Im not sure if this is just me?
I add a merge Node, set up some details... then i go into the advanced section for configure fields

any time change focus to something else and come back, as soon as type the window clears itself

and I then have to hit undo to get all my code back, then i can type. Its not a once in a while... its almost every single time
im using Chrome on v3.5.2.5617