Thanks for the suggestions. I had tried messing with the panel height before -- but I only played around with the max height. Just now I increased the min height, which got set to 19, to 40. That seems to have done the trick. It appears to be back to normal now.

Matt, I think the reason why you were getting a browser warning is because my website is still the old http and not https. Gotta fix that one of these days.