Specifically on OSX, dragging out a tab or a pane and maximising it on a second screen, will not save it correctly to the workspace. Reloading/restoring the workspace will not open the same way you saved it. You will find that all the panes/windows will be stacked on the main screen. Does not seem to occur in 8.0v7.
Customer reported version
Nuke 10.0v4
Steps to reproduce
1) Open Nuke in the Compositing workspace
2) Drag and drop the Viewer to your 2nd screen
3) Maximise it on the new screen
4) Menu->Workspace->Save Workspace... (enter a name and save)
5) Close and reopen Nuke
6) Load your new workspace from the Workspace menu
7) All windows will be stacked on one screen
Reproduced by support
11.0v2 - OSX 10.13
10.0v4 - OSX 10.10.5
10.0v1 - OSX 10.10.5
9.0v9 - OSX 10.10.5
9.0v1 - OSX 10.10.5
Expected behaviour
For the dual screen workspace to be restored correctly
Actual behaviour
The dual screen workspace is not restored correctly