I initially invested when it was still possible to do so with 5x leverage. The message above seems to indicate that those leveraged investments are "grandfathered in", so to speak.
Today I attempted to divest a relatively small amount from my onsite bankroll, an amount which would have left my onsite bankroll significantly larger than 1/4 of my offsite investment, but I still received the error message "That would cause you to become overleveraged. Decrease your offsite investment first."
So unfortunately it appears that it is NOT possible to divest from one's onsite bankroll without being forced to divest some (all?) of one's offsite investment, which is certainly a disappointment.
I'm wondering if the system is in error, or if this is indeed the way things are supposed to be?
That's a consequence of the maximum permitted leverage being lowered to 3:1 a while back, so it's working as expected. While nobody was forced to divest back then either, any changes to an investor's offsite bankroll were required to not exceed the new allowed leverage.
The more recent change disables adding to your offsite bankroll, but it doesn't change the maximum permitted leverage (which is still important when you reduce your onsite or offsite).