Secondary Window performs differently from Primary - with regard to Accusnap hints]

Can anyone help with this. I am using OpenBuildings with a multiple (2) screen set-up.

Why is it that Accusnap hints work fine on views on the primary window but not on the second?

I have changed views between windows, and it does seem this is window (not view dependent).

Also, this is not monitor related, as the same occurs when both Primary and Secondary windows are on the same (single) monitor.

Thanks in advance JE