We've recently updated the 'OpenVR (Desktop)' package from 1.0.3 to 1.0.5 in Package Manager. In certain situations, if you switch versions (1.0.3 -> 1.0.5 or 1.0.5 -> 1.0.3), tracking may be incorrect until you relaunch the editor. This only seems to happen in certain situations when using the SteamVR Plugin asset store asset. If you see tracking issues in the editor after updating the Unity OpenVR package, just relaunch the editor and it should resolve itself. The issue also causes console spew that looks like: Assertion failed on expression: 'IsMatrixValid(matrix)' This should be a one time occurrence when switching between package versions.