Adium contact list moves on Leopard

Since installing Leopard, I've seen my Adium contact list window
sporadically move itself down to the middle of the screen on the
vertical axis periodically. I have the Adium contact list positioned at
the upper-left-hand corner of my screen with these settings:

Color Theme: Aqualicious
List Layout: Aqualicious
Window Style: Borderless Window
Size to fit vertically
Size to fit Horizontally
Maximum Width: 243px

Frequently (like once every day or two) I'll be working on something and
I'll see the Adium contact list move itself down the left edge of the
screen to about halfway between the top and bottom of the screen.

I deleted these files and let Adium re-create them fresh:

/Users/jr/Library/Application Support/Adium 2.0
/Users/jr/Library/Preferences/com.adiumX.adiumX.plist

But it's back to its old tricks in no time. I'm starting to think this
is an Adium Leopard bug. Anyone else seeing this (or similar) behavior?

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JR