Start IDEA. Get 1 project opened. Open 2nd project. Choose Yes to open 2nd project in a separate frame. To surely reproduce the bug close 2nd project, and reopen it in separate frame again.
Now consider dialogs invocable from Main menu | Analyze: Inspect code, Analyze * dependencies, Locate duplicates. Invoked from 1st project frame they have choices 1) Whole project, 2) Project 'name'. While normally the 2nd choice should be Module 'name'. Both choices analyze the whole project.
If only 1 project is opened, the bug is not repeatable.
in the dialog you get 1) Whole project, 2) Project 'name' etc