Actually I've seen the 'pressing enter wipes text' problem before... and it had me stumped for a long time. For me at least, it turned out to be the touchpad on my laptop. Every once in a while it would "sense" my hand and treat it as a click. This would typically select some or all of the text I was typing, and the next keystroke would wipe it all out.
Not necessarily what's going on for others, but it was definitely my problem.
