I'm running into a similar problem with launching a game. DBGL appears to be looking for a lower case Dosbox executable (dosbox), but the actual case of the bundled Dosbox executable is mixed (DOSBox). I fixed this by renaming the bundled Dosbox executable to be lower case.
I just started setting up DBGL on my Macbook Pro and ran into a problem. When I try to launch DBGL, OS X gives an error about the application being corrupt or incomplete. I'm trying to run the 64-bit Cocoa version on OS X 10.6.4. My primary partition is formatted as case sensitive HFS+. Info.plist …