I'm still able to do that. Have you re-booted your computer since this started?
What are you getting instead?
Are you trying to create an equation or just a calculation?
if I double-click on a dimension, I can change it as shown in the picture. But I can not make any calculations as I said before.
If I try, as in the picture to perform an addition comes a message.
This is unfortunately only in German. But there is (give a number greater than or equal to 0 and less than or equal to 1000000.
I do not understand, even a restart of the computer brings nothing.