Not sure where you are meant to report bugs, but on my systems Win64 with latest version of F360, when you insert a derive with more than one design open.
To Replicate:
3 drawings open
Insert derive into first design
When you click ok to insert the derive into your design, it shows design 3 rather than showing design 1.
As I say its minor but annoying.
One further annoying issue is that the ordering within initial derive selection box is not remembered from previous use.
To Replicate:
From within a design Insert Derive, it brings up your file list, you can select the branch and the order. of files. If you then insert another Derive, the previous choices are not remembered.
Fusion
