After deleting and rebuilding my path auto modules the path for a og panel one sets at e.g.
node/663/og_panels/form/102?destination=node%2F663%2Fog_panels
is not showing anymore. Instead one sees
something like node/663/og-panel/2

I had to edit node/663/og_panels/form/102?destination=node%2F663%2Fog_panels
change the path - save - edit again and set to it's original value.

Maybe it is a caching issue ...