I removed everything related to quaternion from my $HOME directory tree and logged back in. It still doesn't display any messages. Here's what it outputs when I click on a different channel:
Opening room "#quotient:matrix.org" Connected to room "!yBCfIaIJPwYXMoldTd:matrix.org" as "@jgibbons:matrix.org" Filtering 100 user(s) in "Quotient (former QMatrixClient)" took 451 µs 100 user(s) in the room Filtering 100 user(s) in "Quotient (former QMatrixClient)" took 369 µs 1 ms to select room #quotient:matrix.org libpng warning: iCCP: known incorrect sRGB profile or Opening room "#community-librem-5:talk.puri.sm" Disconnected from "!aXWDJNTtEfhSXdPoQT:talk.puri.sm" Connected to room "!BSqRHgvCtIsGittkBG:talk.puri.sm" as "@jgibbons:matrix.org" Filtering 24 user(s) in "community/librem-5" took 96 µs 24 user(s) in the room Filtering 24 user(s) in "community/librem-5" took 53 µs 1 ms to select room #community-librem-5:talk.puri.sm Nothing wrong with the api. Probably something wrong with the app. Someone on the Quotient matrix channel suggested it might be QT5 isn't setup correctly. Any merit to that possibility?