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This gets set once, and I couldn't find out how to change it. I snooped around the registry, and reset it manually, but this should be documented, and be more easily changed from within the IDE itself. NOTE: This happened 2 weeks ago, and you may have fixed this by now! ;-)
You can use -userdir switch when you want to use different user dir. Installer was not designed to allow user to change this.
Resolved for 3.4 or earlier, no new info since then -> closing.