Galactic Civilizations - Dark Avatar 1.50
Its the version I downloaded yesterday (09 Feb 2007). As I loaded up SDC an update was ready, so no idea if the bug is still present.
This is a really minor bug, would have posted it to the Official DA bug thread but that doesn't exist (yet?)
When viewing the Planetary Improvements screen (Planet screen?), and another planet flips (cultural takeover), the screen changes to reflect the captured planet's improvements, but the title still declares it to be the original planet you were viewing.
Kinda made me go

at first, the Class 14 planet I was working on suddenly became a Class 6, heh.
Again, super minor. Doing my part as a bug-reportin' player.