I just did a quick test here and despite of having code to prevent this kind of issue on a machine that uses comma ( , ) as the decimal point, it doesn't seem like the conversion is working correctly. The only quick fix I have for you is to set the regional settings format to US/English (so . is used instead of ,) but we'll have to fix this in the radio modules.
Regarding the Cinergy 600 stereo, the code is in place -- I have one of those but it will be a few weeks before I get to try it (cause I'm 5000 miles away right now) -- have you tried a different skin and/or are you able to see the stereo indication correctly with another radio card (i.e. ADS) ?