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Thanks @valued-customer, that relieves a little bit of stress.
Any idea when it's fixed?

Yesterday it got fixed for me. As I don't know why it broke, or why it isn't now, and whether that applies to us all, or only me, I have no idea. None.

What I know is that as soon as I saw my VP over 90% I went on a mad voting spree, and now need to sit quietly in a corner for a day or so, again.

I am very unhappy with the VP decay system, and it is dramatically preventing me from voting posts I find useful. Since it isn't happening only to me, this is hugely negative on the entire platform, to the point where content is languishing undiscovered in droves, and, particularly new accounts, are strongly discouraged from putting effort into creating.

This is perhaps the most pressing issue for Steemit devs atm. I strongly support @neoxian's idea to make VP decay something that witnesses can determine amongst themselves, so that hard forks are unnecessary to experiment with it.