hi,
I try the demo version of leonardo 3.3.0, when i choose "demo - poloniex" there is no currency pair to choose, completely blank.
Other exchange is okay.
Please take a look, Thks.
Strange? I just tried and it worked!
Is it still a problem?
Best wishes,
Jonathan
Please take a look my screenshots


"demo poloniex" still show no pairs.
Jonathan will surely answer you, and better than myself, but meanwhile if I were you, I would try to delete the content of you .leonardo folder (which is where all the settings & logs are stored, if I understand correctly). I see from your screenshots you are using Windows, so it is in C:\users\[your_user]\.leonardo. (You might need to "Show hidden files and folders" before.)
Or simply rename that folder from .leonardo to .leonardo-backup if you want to send your logs to Jonathan for troubleshooting afterwards.
I hope this helps.