Again my question:
what happens exactly, how to reproduce ?
hi thanks for your reply,
I'm using c:b v 8.02,
i'm on ubuntu karmic cola,
another strange thing is it is bringing up the compilers auto detection on ever startup now.
is there some add-on i can disable to stop this.
do you know where the compiler settings are stored, so i can backup the file / restore when this happens.
thanks for any help
The compiler settings are stored in 
default.conf (if you do not use the 
-p, 
--personality or 
--profile parameter at the commandline)  in 
~/.codeblocks.
If the compiler auto detection pops up, look which compiler shows an empty installation path. After starting C::B, go to "Settings -> Compiler and debugger -> [the compiler with the empty path] -> Toolchain executables", try the autodetection, or put a dummy path into the installation path, if it is empty (e.g. 
/usr) and close the dialolg with 
OK, close C::B and restart it, the popup should no longer appear.
You can also try to backup the 
default.conf and remove the old file. C::B will generate a new default one, that should work.
Be aware, that the settings are saved (automatically) on (clean) close of C::B, 
not if you leave the dialog.