BI5 No Signal ... Decoder not initialized

[wall46]

Just installed/upgraded to BI5 and it shows this "No Signal...Decoder not initialized" for my two IPcams.
Closing and restart BI5 doesn't help

Anyhow the (until now not desinstalled) BI4 still works fine.

I run BI5 and BI4 not in parallel, one is always closed and the other freshly started.

Any suggestions? Thanks!

I have two Dahua SD-22204 POE