OpenTTD

Non-dedicated server gets stuck when selecting a savegame file to load while a client is joining and the server is encoding the save to the client.

This bug is a bit hard to reproduce. It requires 3 things and exact timing:
1 - a savegame file already available to load, preferibly large (4096x4096 map)
2 - a non-dedicated server running, preferibly large (4096x4096 map)
3 - a client joining the server.

Steps:
1+2. Have the savegame file ready for the server:
- launch openttd
- click multiplayer
- click start server
- click new game
- generate a large map (4096x4096 map)
- once it generates, save this game
- have the load game window already open, but before clicking the savegame, a client has to join first

3. A client joins the server:
- launch openttd
- click multiplayer
- join the server, and then...

... the bug:
- the server will display SAVING GAME when the client joins.
- with the load game window open, time to click the savegame to happen exactly when SAVING GAME message is being displayed.

Result:
- Server gets stuck.
- Client gets a 20 seconds message without an answer from the server, then network-connection lost