When starting a GECAMed client it will write some logfiles to your computer. These can be found in the following directory
|Platform||Property File Location|
|Windows (bis XP)||C:\Documents and Settings\USERNAME\.gecamed\|
|Windows (seit Vista)||C:\Users\USERNAME\.gecamed\|
|Mac OS X||~/.gecamed/|
The files are called GECAMed.log.N.M wher N and M are numbers. Look always at the latest logfile to see recent error messages.