I just noticed my DC changed the option values to inches. I cannot set them back to centimeter (my model units), except for manually changing every attribute.
I tries @Anssi 's recommendation but that did not help.
I have the problem across all my files and different components.
Any idea on what might cause this or how to prevent this in the future?
When I open the file you posted, the DC Options dialog shows dimensions in centimeters.
I would suggest closing the DC Options and Attributes windows, turning on the “Display units format”, saving, quitting SketchUp and reopening the file. (All this might not be necessary, but at least, if the DC Options window is open, it won’t update if you change the setting)