@MichielS I've set my devices to an African time for a while and then set them back to my own time zone. All's fine, so I guess they fixed it, or we ran out of the faulty time period.

Thanks for your post here Eric. The Africa time zone workaround from Hiz actually works for me. Obviously it's only a workaround, not a solution, cause it will require changing the zone again...

I have exactly the same problem. I have 4 HS100 units that all suffer from this problem. My other HS110 units reflected the change from DST to Standard time just fine. I hope tp-link will fix this...