Open With always opens new program instead of using one that is already open.
In Blackboard I choose to open a students file. The window pops up to open with Autodesk Revit(Default) However even though Revit is already running it will open a new session. It never did this before.
That is usually controlled by a setting in the affected program to allow only one instance or multiple instances of that program.
If I open Revit it allows me to up an unlimited amount of files. This just started happening the other day.