cannot adjust points any more?

Yes, this is because you updated to 4.1 in which the cover for the modal window is placed to high, covering the entire page.

You can read more about it in the myCRED support forum along with how to fix it for now before 1.6 comes out.

https://mycred.me/support/forums/topic/greyed-out-screen-when-manually-adjusting-points/