Issue
We've seen a few cases recently where Inventor fails to load after startup, and the mouse cursor is blinking and loading non-stop.
Solution
The cause appears to be due to the installed Anti-virus software, which will need to be investigated by the System Administrator as the first step of troubleshooting.
More information on this problem here;
Once the AV has been checked, configured, disabled or uninstalled, and if the problem still persists, please reach out and we'll double-check the system and find out what's going wrong.