Hey @knut.tjensvoll !
We saw this issue in the past when an old version of Core was being loaded by mistake…
See: Grasshopper Speckle Connector install issues - #17 by teocomi
Here’s some additional context too that might be useful:
When developing/debugging, the kits should get copied in the right location (appdata) when you build the Converter project.
So I would suggest always rebuilding the whole Connector solution.
Accounts, instead need to be set up manually from Manager or Desktop UI (eg the Rhino Connector).
Both accounts and kits should live in %appdata%\Speckle.
You should try avoiding mixing a development version of the connectors and the ones from Manager, as there might be involuntary crossovers.
I’d suggest cleaning your environment by removing any version of the Gh/Rhino connectors and trying again.
Also, as you noticed, from 2.7 onwards the GH&Rhino connectors are bundled together when installing from Manager, not sure if that’s part of your problem as well!