Demo playback has an interesting failure mode: if you have UrT 4.1.1, you can play and record on 4.1 servers (such as DSWP) just fine, but when playing back the demo, weird things can occur (up to and including dropping back into the main menu with an error message). The reason is that some maps were updated for 4.1.1 while retaining exactly the same name — and when you’re playing back a demo recorded on the previous version of the map, data in the demo and structure of the map will clash.

The affected maps are Casa, Harbortown, Ramelle, Ricochet, Subway, Swim, Thingley, Tombs and Uptown. (Some of the new maps in 4.1.1 started out as custom maps and you may run into the same problems with them in case the standalone version and the 4.1.1 version have any differences.)

To view 4.1 demos on 4.1.1, you have to temporarily rename or move zpak001_assets.pk3; there’s currently no other way.