I’m not sure this has to do with an upgrade… but I’m making no changes to the card code other than an entity “friendly” name in the card, and I can’t save due to the progress wheel spinning incessantly:
I’ve attempted creating new cards in new views… same issue. As soon as I open any existing card, the save button is unavailable.
HA 2021.3.3, Frontend version: 20210302.6. Tried restarting HA and problem persists.
EDIT: I searched and found a few other threads with this same issue… but no concrete solution identified. I restarted HA a few times, and that didn’t work. I tried a few different views, and all were the same. Eventually I logged out of HA, cleared my cache, closed my browser, and then logged back in… and that seems to have done the trick. Solved.