Due to changes to the Random Number Generator in this release, Wesnoth 1.11.13 is [b]incompatible[/b] with previous versions up to and including 1.11.12. The following are some of the consequences of these changes:

[list][*]1.11.13 cannot be used to play MP games with players running 1.11.12 and earlier.
[*]Loading [b]saved games[/b] from 1.11.12 and previous versions will work, but any [b]replays[/b] contained therein will not. Furthermore, any replays generated after resuming a game saved with 1.11.12 or earlier will be corrupt.
[*]Using Undo/Redo with moves that were recorded in saved games from 1.11.12 and earlier will cause replay corruption and even result in [acronym=Out Of Sync]OOS[/acronym] errors under certain circumstances.
[*]Saved games marked as “Scenario start” (not turn 1) in their description are unaffected by these changes.[/list]