IntelliJ IDEA Ultimate project loading issue
Answered
So, today in the morning I closed down IntelliJ(2017.3.3) after doing some programming as usual and everything worked great. Now suddenly when I try to open any of my projects this is the view I am greeted with:

After searching for a solution for this issue I managed to get the projects working by doing the following steps:
- File -> Project Structure -> Modules -> + -> Import -> The project .iml file
- File -> Project Structure -> Project -> Project SDK -> Java 8 in my case
- File -> Project Structure -> Project -> Project language level -> 8
- File -> Project Structure -> Project -> Project compiler output -> The path to the out folder of the specific project(the whole path from D:\ to it)
- Navigate to Main class in project structure and alt+enter to add it to run configurations.
- Finally able to run the project
Now this would be fine if I had to do it once, configuration corruption or whatever happens, but I have to do this every single time I open a project for some reason. I tried restarting my PC, reinstalling 2017.3.3, installing 2018.1 and the issue persists whatever I do. Also there were no visible errors in relation to this issue in any of the above scenarios, steps, installs and so on.
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Well it turns out the issue was related to me using OneDrive to backup my data. I assume OneDrive updated at some point and activated Files On-Demand. The issue is documented here. For me personally a solution that worked was:
1. Right click the OneDrive tray icon
2. Click settings
3. Click the settings tab
4. Disable the Save space and download files as you use them option under Files On-Demand.
5. Wait for your files to sync up completely, IntelliJ project load is back to normal.
Hi. Thank you for the information.
Thank you for this. This Windows Update Killed me for a day - and it was the new OneDrive Save Space feature which was the issue. Wouldn't have found it without this post.
Thanks