BCM Opportunity: click on "new op" opens a "new tasks"

[Ingo]

Hello,
After installing a big bunch of MS updates recently, I was delighted to see the label issue fixed. But I discovered something weird instead:

(1) clicking on an existing "opportunity" from my ops list, the form for "new tasks" opens rather than the op's details.
(2) the same happens by clicking on "new opportunity"

Any help or idea?

Thanks a lot in advance.

Ingo