My PC with dual EVGA 2080 Ti has No issues with X1 v1.02 .... saving & opening where I left it
I did have to "jump through a couple of Hoops" when Upgrading the version of X1 on my Win 10 machine
When installing ...are you getting several security alerts - generated in Windows 10 ... "blocked program" ... you need to: check "Windows Security" "Allow an App through Controlled folder access" ---> if you noticed a Security pop-up during the Software's install Also check the: "Recently blocked apps"
Handy step by step how to: Add or Remove Allowed Apps for Controlled Folder Access
I go offline to install, then shut down All background software - yep, even security software