Hi Aimee,
The “Jumpy Lines” thing started happening I believe since you changed from the green forum environment. I think it happens only when replying, not when initially posting. But I am not 100% certain.
I don't know if it is related to how many characters are typed or how many lines or "Enters" are used. It might be a combination of things. I suspect it might be related to all the little people expressions we can choose from along the top.
Try this to see if “jumpy” happens to you. Reply to this thread. In the gray text edit window, hold the "Enter" down for 20 seconds or so. Then start typing. You should see "jumpy" happening. With every key stroke the screen scrolls to show what you are typing for a split second, then jumps to the top or near the top of your reply.
We end up typing blind after a while. Then we proof read by scrolling down. Any editing, and it immediately reoccurs. It is consistent. I can count on it happening after so many lines of text, though the quantity seems to vary from reply to reply.
1
2
3
On this reply that I am typing right now, "jumpy" starts at the "3" and is always there from that point down.
Copy and paste my text into your reply and the same should happen for you. Maybe this is a "Windows Only" problem. You work on a Mac, right?
testing for jumpy lines, but I just do not get any of them.
Let's see about a few more lines.
I'm using Mac OS X with Firefox 3.6.23

throwing in some emotes to see if I see jumping
nothing
