Answer by lucasbatista · Sep 05, 2017 at 10:05 PM
I am having the same error! I work in an educational environment and I activated my unity using an adm account. When students try to login in the unity using their personal accounts, I have the same error reported above, namely, the unity loses its license. In previous version of Unity (for instance 5.6.3), I activated unity using an adm account and the students login in unity normally to download and work in their projects. Only in unity version 2017.1.0p4, after the student login unity loses the license.
Delete C:/ProgramData/Unity/ Restart or better Reinstall Unity
Hi @Positive7, thank you for your anwser. The Students do not have writting permissions on this folder. So, if I restart the computer Unity 2017.1 is back to normal. If I set full control for all users in unity_lic.ulf, unity's license is lost and I need to delete C:\ProgramData\Unity, restart the computer, and activate the unity again.