"Reset All User Settings" works. I have an OS with German language. Switching back to the default language (German), I am able to define a thermal conductivity of 0,3W/mK. Switching the language of Discovery Live back to English I am not able to define a thermal conductivity of 0.3W/mk nor of 0,3W/mK. Both decimal values are ignored and I get 3W/mK instead.
Do you have any idea how to manage this issue?
(I have also deleted the Material Library file as suggested)