Storyline 360 crashes when try to copy/paste

I am also having this issue with both Storyline 360 and Storyline 3. Any attempt to copy and paste content, be it slides, scenes or elements on slides themselves, results in one of three things happening:

1. Storyline crashes and closes, losing work and necessitating a restart and recovery
2. Storyline invokes the "Something Went Wrong Pop Up", allowing me to ffedback my experience to Articulate
3. Absolutely nothing happens at all. That is to say, Storyline is clearly "thinking" about doing something as the application becomes unresponsive and the cursor changes to a spinning ring. When it finishes "thinking", nothing has changed and no content has been pasted in. This also happens if I try to Import the content using the Import Storyline feature. 

This is a fundamental and show-stopping bug that needs rectifying immediately. I have a scene that we use for an interactive glossary that contains 28 slides full of terms and phrases along with their descriptions that would take days to reconstruct in a new project.

I have tried repairing my installation, as instructed above, along with ensuring the latest .NET and Flash installations are in place.

I have also raised a ticket and am awaiting a response.

My team has just invested in upgrades to v3 at a not insignificant cost, only to find that SL2 is more stable.