Hi again! I've run into a few minor problems.

Problem 1: Drag-and-dropping the .plan file used to open it in the window now it doesn't seem to work anymore.

Problem 2: Running a .plan file in a link card opens the plan in another window albeit in an older version of Masterplan (despite directing the "Open file with" windows prompt to the latest version of Masterplan.

That's all! I hope you'll be able to look into them and Thanks for this wonderful tool!