"Motion To Forces" - Behaviors/Filters Misbehaving?

Hello folks,

I'm experiencing an odd kind of error in Apple Motion 4.0.3.
Recently when I have been adding or duplicating behaviors or filters to layers, say for example - I add the filter "Invert" to a layer - the filter will appear titled as "Motion To Forces" in the Layers tab.
When I select the "Motion To Forces" filter/behavior in the Layers tab, and refer to the Inspector's "Properties" tab - the filter/behavior appears to be associated with a totally different layer in the Motion project. By deleting the "Motion To Forces", I am left with a non-titled filter/behavior, yet the effect the "Motion To Forces" filter/behavior is still present with the selected layer. The layer with "Motion To Forces" applied also becomes unresponsive to changes of the layers parameters.

The only way I can temporarily resolve this issue, is to save my Motion project, close, and reopen again. Only then will the "Motion To Forces" 'filter' have been reverted to the filter which I had originally selected/duplicated to a particular layer.
My current Motion project has multiple layers in 3D space -it seems now that I have many dozens of layers, that the issue is cropping up. I don't experience this issue with projects that have fewer layers.

I have reset Motion's preferences "p-list' file, and also reinstalled Motion back to Motion 4.0.0.
Still no love.

Nowhere on the internet have I found references to the "Motion To Forces" issue as experienced above.


Any suggestions and help are hugely appreciated.
Thanks,
Andrew