No sound in overbridge?

Hello, recently I stopped having any sound in ableton when using overbridge. The ob control panel signals there is sound, but even though im monitoring the track in ableton there is no sound… any idea what could be the problem ?+

After updating to macOS 10.15.4 today, I go a message after restart that a certain extension from Elektron Machines was no longer valid. There may be a need for an update under this new Catalina version.

Personnally I am under sierra so…