I just had something to happen to me for the first time in 20 years. While in the middle of editing a text field in an MTEXT, a message popped up saying my license was invalid and it force closed Civil 3D without even giving me the option to save. I immediately reopened C3D and my drawings without any errors.
Why would an invalid license error pop up and force close C3D without even an option to save? I have a stand alone license, btw.
C3D 2022-2025
Windows 11
32GB RAM