I meant in the “OUTPUT” pane, there is a dropdown to the right, there you can check the “ElixirLS” log.
Though as far as I remember, mjmcloug.vscode-elixir builds on the “elixir-sense” library which is used in the LS-fork as well.
Therefore it might be, that either both extensions are conflicting, or, as the last release of mjmcloug.vscode-elixir is from 2017, it might just be, that it suffers from the same incompatibilites with Elixir 1.10, that also JakeBeckers LS implementation now suffers from.
Try deactivating that plugin.
