The Yuri's Revenge
Assault mappacks have been updated. All users of the mappacks should update with the new versions... certainly to avoid mismatch errors if playing online, and otherwise just to get the bugfixes and improvements if playing skirmish.
The prime reason for the update involves a bug affecting Prism tower networks, which led to other improvements and enhancements once it was clear that an update was necessary. This is all better explained in
this C-GEN forum topic and in
this DeeZire forum topic.
Again, everyone should
update with the new versions of the mappacks. Or if you never got them in the first place, then now's the time to try them
