I went back to my old note about this problem, and I did the same thing, uninstalling 1.0.21 and installing the latest.
The reason this happened again is that I had to reinstall Eclipse because of some other unrelated corruption.
This fixed all the other problems, but now I’m seeing a new problem. Of my three Gradle projects in my workspace, two of them give me the same error:
Invalid Gradle project configuration file: .settings/org.eclipse.buildship.core.prefs
And that is ALL it says. There’s nothing in the log. No indication of what about the file is invalid. However, I see that the contents of that file is identical in both of those projects, the diff of which is shown in my previous reply.
So, I then tried editing that file in one of the bad projects (in an external editor), and simply inserting the missing lines, compared to the “good” project. I then refreshed the bad project, and the error went away.
I don’t know what’s going on here, but at the least, I would think that the newer buildship is not dealing well with a prefs file that is in a slightly unexpected form, and I would think it should be able to deal with this.