Problem: From the master document view I am unable to launch or edit any subdocuments using the view pulldown. This appears to also happen on the older 7.0.3 modification for this release, I tried it there too. By right clicking on any subdocument in your master document view you are presented with a pulldown of actions, the edit action does not work.
Workaround: From the master document view I am able to launch or edit any subdocuments using the button in the frame menu, that would be the second one from the left with the pencil in it.
I have also found that double-clicking on the item in the view will also launch the editor for that file.
Running on Win10 x64 Ultimate with the following LO release.