Version 1.21 does not resolve the "The throughput of the SD Card on your camera is not currently enough for recording" error.
Some info that may help narrow this down:
For me this error only occurs with a specific network setup.
When connected to a router that can see the internet (DHCP assigning a 192.168.213.x address), I get full SD functionality, verified with 3 different SD cards (up to class 10.) No problems.
Once I move the camera to a router disconnected from the internet and assign a static IP (172.16.0.x), the error appears and I have no SD functionality on any of the cards.
I can consistently move the camera back and forth between the two routers to see the error come and go.
At one point I had SD functionality in both scenarios, but no longer.