poets2gather on "Why are our pictures sometimes tiny?"

I just uploaded two "double" screenshots to our media library, double in the sense that each combines a section of the page in question as it appeared in Firefox and a section as it appeared (yesterday AM) in IE 9. Here are links:
http://sunkengardenpoetry.org/?attachment_id=1144
http://sunkengardenpoetry.org/?attachment_id=1145
The problem can occur (and has) on pretty much any page; it can happen with smaller images and with larger ones. I thought once that it might have to do with whether or not the page was magnified, but I don't think that's a factor. I don't believe I've ever seen it happen with Firefox or Safari. I tried getting a newer version of IE9; Microsoft says I have the newest. And this is an intermittent problem; yesterday's occurrence was the first for me in a long time.