I restarted my laptop and now QElectroTech seems to be behaving reliably and I am able to copy/paste elements between folios.

I am running Ubuntu 19.10 and first tried installing QElectroTech using apt install.
This installed Version 0.6.
I loaded up an example project and then tried to copy elements/diagrams into my own project. Each time, QElectroTech froze/crashed.
Today I updated dependencies and compiled QElectroTech from source.
I now have Version 0.7 installed.
The exact same thing is happening. I tried to copy/paste an element from one diagram to another and QElectroTech froze.
If anyone could help/advise, this would be most appreciated.