Download Response as PDF is working for me. Here is what I did, I select a row in the Response table, right click to bring up the context menu, and select Download Response as PDF option. Please try this and with other forms as well. If you still encounter this with your forms, you can share your form with me, firstname.lastname@example.org. I can help take a look.
I does not work. A window pops up that looks like it's working with a moving bar, but i can let it sit for hours and it won't save.