Spring RTS Engine

My game(Void) has some weird sync issues. During games it keeps displaying even if it seems to work.
Other times players can't connect at all(might be fixed by using an autohost) or doesn't show people as snyced up in lobby.
I am seriously out of ideas what could cause those problems that never seem to go away.

Warning: [DESYNC WARNING] path-checksum a8f14098 for player 1 (...) does not match local checksum a95cc326; stale PathEstimator-cache?

That only displays once at gamestart, or really during game? It can be ignored appearently, in xta some players cause that message every game once at start and it seems to cause no further problems.

Other times players can't connect at all(might be fixed by using an autohost)

problem of routersettings (ports) or something. use relayhost/autohost.

or doesn't show people as snyced up in lobby.

well, your game file is just named void.sdz so it is hard to find out if every player has the same version. put versionnumber in filename, for maps too.

i think a full infolog.txt would help, and yes, always use version numbers for maps, if you update them...