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did you try the new 'test' button in the Oracle Home selector dialog in the 4.0.1 preferences page?
That will confirm your client is available when needed for connections and other things like disconnected password resets.
I managed to get it working. It turned out that when I let it import my settings from the previous version, it doesn't seem to have imported that one correctly. It was showing as enabled for the OCI driver, but it actually wasn't.
So I had to disable it (and restart), and then enable it (and restart). After that, it worked fine.