Edits in fusion not seen on viewer until mouse is released

Hello,
I have an issue working on the Fusion Page which appeared all of a sudden, or I changed some settings that made this happen.
I am not able anymore to see changes in the Fusion page viewer applied "live". Edits are visible only after I release the mouse left button.

For example: I attach a Text+ node to the input of a Blur node. If I drag the "Blur Size" bar, I can see the effect only after I release it. While I keep the left button pressed, nothing happens in the viewer.
This happens for every node, every control.

What did I change?

Thanks for your help

All timeline? All projects?

All timeline? All projects?

Good question. It indeed happens only on the project I've been working on. I created a new project and the updates are live.

The issue seems to happen randomly. The workaround is creating a new Fusion Composition and copy and paste all the nodes. Copying the entire Fusion Composition did not work.

This is a clear bug.