Why are some modules underlined in red in the tool window if all dependencies are enabled?

Can you build the project (Build | Rebuild Project action) successfully? Is there any tooltip shown when you hovering over this error?

This might be the https://youtrack.jetbrains.com/issue/IDEA-227568 Could you attach screenshot of File | Settings | Build, Execution, Deployment | Build Tools | Gradle settings page and idea.log file after IDE restart and trying to re-import project in Gradle tool window? Thanks.

For uploading you can use ftp://ftp.intellij.net/.uploads / https://uploads.services.jetbrains.com or any file sharing service.

The problem disappeared yesterday, but at what point - I did not notice.

The project was built and launched, but I did not see any tooltip.

But it was definitely not this problem (https://youtrack.jetbrains.com/issue/IDEA-227568?_ga=2.124384905.2091632718.1578896851-952176289.1575290145).

Here is a screenshot of the settings. They did not change.

Apparently, the idea.log is now not relevant?

Thank for the information. If you have idea.log file containing the time period when issue happened it would worth to check it still. Thank you.

I downloaded the idea.log file from this link https://uploads.services.jetbrains.com/?_ga=2.86030107.2091632718.1578896851-952176289.1575290145 

Thanks. Unfortunately see no issues on 14th in log file. Only one INFO message

2020-01-14 11:04:27,873 [ 11795] INFO - penapi.vfs.impl.jar.JarHandler - /opt/gradle/gradle-5.2.1/caches/modules-2/files-2.1/org.seleniumhq.selenium/selenium-firefox-driver/3.141.59/a99f2fe2a42747ed9809d4f62f51a9e1b336dde8/selenium-firefox-driver-3.141.59.jar: META-INF/versions/9 should be a directory 

but it does not look like it can cause the issue.