Engage Interaction not functioning properly
Here's a puzzle; I recently transferred all our active Studio 13 course folders to Dropbox, having been running them on a laptop without difficulty for some while. All the courses still run perfectly from the laptop, while downloading from and saving to Dropbox.
I then deleted Studio 09 from my desktop, and downloaded and activated Studio 13. But when I run a course in the Dropbox folder, and try to Edit an interaction, there is no response at all. If I try to insert the interaction into the course from the course folder, I get a box with "Critical Error; could not initialise Insert Engage Interaction dialogue."
If I run the interaction from the course folder, Engage opens with the interaction edit screen as normal, and the interaction runs perfectly using Preview.
The interaction runs perfectly in Articulate > Preview This Slide only in Presenter.
If I change the title of the interaction and file it separately in the course folder, I still cannot insert it and get the same error message.
Meanwhile if I use my laptop the course and all interactions function normally. So the problem lies in the desktop. I have uninstalled Studio 13 and reinstalled it twice, with no change. The machine runs on W7 Pro, and Powerpoint 2007; both have the latest updates. The system requirements include both of those.
All ideas welcomed!