First off, I had no choice to avoid this update. Second, I do not have an option to roll it back/uninstall it.
I rely on Metagrid Pro. WIth this new update, loopMIDI no longer works, but there are built in loopbacks available for 1.0 and 2.0. It all seems simple enough. Create the loopback(s), add those ports to metaserver (for me i created 2 v1.0 ports, metaGrid and Reaper and assign them in metaserver (metasystem MIDI gets metaGrid in/out and Reaper gets Reaper in/Out.) Then in Reaper I assigned midi input from metaGrid to input + control, and output to Reaper.
however, this never worked. in the midi monitor now included in the new windows midi musician settings I see no midi activity on the metaGrid port when i press buttons on the iPad.
Pete Brown, lead MS audio dev is trying his best on discord and VI control but I’ve been down for 2 days.