No matter what I type in CAS, I only get question marks as the answer
I'm currently using the newest version of GeoGebra. I have this problem with CAS, I only get question marks as an answer to every mathematic problem I have. This happened both in the newest version, and in the previous one. It only happens when I'm using my laptop (which is where I need it to work because of school). It works fine on my stationary PC at home. I tried searching your on your forums and googling, but nobody had the same problem as I do. I attached a picture of it happening.
Version: 6.0.423.0-offline (24 January 2018)