The upper left key (left of "1") doesn't work on macOS for some layouts, specifically those that use the ISO physical layout. This is a regression caused by this upstream commit: https://github.com/TigerVNC/tigervnc/commit/0c15866f0c86402016e55eeb7c044eb2e6cd95f5 It was pulled in to ThinLinc in bug 7158 for 4.9.0. Upstream bug report/pull request: https://github.com/TigerVNC/tigervnc/pull/1506
(In reply to Pierre Ossman from comment #0) > > It was pulled in to ThinLinc in bug 7158 for 4.9.0. > Typo. It was for 4.10.0.