Spring RTS Engine

On this fine macbook I can play Spring so fine, but only in multiplayer with weblobby. But now the shit hits the fan when I start the spring.exe (or whatever an exe is on mac, there is no extension) then spring crashes as soon "test the game" is clicked. I tried games: xta,ba, spring:94.1, 91.0, maps: aliendesert and avalanche-v2, AI: null ai or "sandbox"

With the new "Launch the game directly" button in weblobby singleplayer it works too.

infolog and at end is attached details from mac crash dialog:
http://pastebin.com/h5A8Zcbu

XTA says missing explo2.tga when launched with weblobby "launch the game directly" function:

http://pastebin.com/Rraesr5a

in multiplay works!

I think it is something how spring is started and not corrupt files or something like that:

Springtanks rc6.0 can start sucessfully and shows its ingame menu.
Then when a mission is selected and spring tries to restart, it crashes.