The problem with the decimal-numbers persists.
To reproduce: Try to make class-breaks under "Symbols" wit numbers formated like 16802,42.
The "Scheme options" window displays the comma as a point. Could be no problem, but the classes are not correct. Most of the points are themed with the "Default Symbol". And if you try to edit the class-borders by yourself, the decimal-point is deleted and the numbers are all getting big (16802.42 changes to 1680242).
Very annoying problem, because class-breaks are very important!
EDIT:
"Unique Value" symbology is working fine and as expected. The numbers are correctly displayed in "Scheme options", wit a comma, not a point.