Can you still access the forum, or is it also a white page?
If the forum is also affected, it's possible that, when switching back, your username implicitly saved a style that does not exist as the default selection. You may be able to fix this by modifying the user via the AdminCP and selecting a valid style from the "Style" setting (right pane) for that user.
You may still have problems if the user's session is still in the database, so you probably want to wait the 15 minutes from your last attempt, or manually remove the record from the database first.
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