Lightroom: LR 4.1RC2 GPS altitude in development module doesn't handle decimal separator right

LR4.1 RC2, platform: Windows 7 64bit, German
GPS altitude in development module doesn't handle decimal separator right.
Separator is set to "," on my PC (standard in Germany). Lightroom OUTPUTS the "," correct, but when the altitude field is left, it complains that altitude is invalid. When I however enter altitude with "." as decimal separator, LR accepts that.
Boys and girls, there's a world outside of the US :)