Allright, this bug was discovered by Psychedelic_hands (https://forum.megaglest.org/index.php?topic=7590.msg77599#msg77599), who originally thought it might be an issue with the map editor, but I took a look into it and it seems to be a bug in gae.
The Bug: Apparently, there is a problem with the '-loadmap' commandline argument.
$ ./glestadv -loadmap /home/thomas/glestae_git/data/game/maps/riverside.gbm forest
[/home/thomas/.glestadv/] is in the search path.
[/home/thomas/.glestadv//addons/autumn.7z] is in the search path.
[/home/thomas/.glestadv//addons/swamp.7z] is in the search path.
[/home/thomas/glestae_git/build/../data/game] is in the search path.
config-dir: /home/thomas/.glestadv/
data-dir: /home/thomas/glestae_git/build/../data/game
Init Window: 1 ms.
Init OpenGL: 106 ms.
Load WidgetConfig: 174 ms.
Renderer Load Config: 0 ms.
Renderer Init Resources: 192 ms.
Renderer Load Shader: 42 ms.
Init Renderer: 263 ms.
Init Sound: 7 ms.
Error loading map: /home/thomas/glestae_git/data/game/maps/riverside.gbm
can't open for read: home/thomas/glestae_git/data/game/maps/riverside.gbm
Crash
Version: Advanced Engine git-master+git_8dde6f2 0.3-857-g8dde6f2
Built: Fr 7. Okt 16:41:20 CEST 2011
Time: Fri Oct 7 16:46:17 2011
Description: SIGSEGV: address not mapped to object
Address: 0xa8
Backtrace:
./glestadv(_ZN6Shared8Platform24PlatformExceptionHandler7handlerEiP7siginfoPv+0x2f4) [0x8569586]
[0xc0d40c]
./glestadv(_ZNK5Glest7Widgets6Widget9getParentEv+0x6) [0x837ac24]
./glestadv(_ZN5Glest3Gui13UserInterface4initEv+0x4e6) [0x83c1bd6]
./glestadv(_ZN5Glest3Gui9GameState4initEv+0x61b) [0x8374bdb]
./glestadv(_ZN5Glest4Main7Program8setStateEPNS0_12ProgramStateE+0xac) [0x83dda66]
./glestadv(_ZN5Glest4Main7Program4initEv+0x3c2) [0x83dc478]
./glestadv(_ZN5Glest4Main9glestMainEiPPc+0x272) [0x83d8644]
./glestadv(main+0x79) [0x83d89f2]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x639e37]
./glestadv() [0x82fe481]
=======================
[URL=http://imageshack.us/photo/my-images/97/glestadvcrash07oct20111.png/][IMG]http://img97.imageshack.us/img97/3760/glestadvcrash07oct20111.png[/img][/URL]
Edit by Omega: Spoiler tags must be on a new line, or their contents will be only half a line in height (in other words, squished).