DrSiN made a clarifying forum post on the Atari forums today. Many of those worried about switching to UT2004 and losing their work can take a deep breath and relax.Most maps will work right out of the box but there may be an issue with texture clamping on some sky boxes. It's a minor visual issue. Also, there is new static mesh collision code so any old mesh package will have to be converted on load which takes some additional time. Map authors can reissue their maps/packages but loading them in the editor and resaving them. Then there is no longer a need to auto-convert them.Must mutators will probably work right out of the box as long as they don't implement UI. Anything with new weapons will have to under go some minor changes as will anything with UI.