In Studio One 4 the GUI for Bitspeek doesn't show. In Renoise 3 it says there's a fatal error with the GUI. I downloaded it again and reinstalled it but get the same error. Windows 10, 64 bit. Any ideas?

Odd! I just tried Studio One 4 here myself and it works fine. Have you tried any of our other products? Same thing?

Microtonic works fine. Bitspeek seems to work, it's just the GUI won't show. But in Renoise it won't load at all.

Since all our products use the same UI code nowadays I must ask you to first double-check that you do not have any other versions installed, e.g. an older version or a 32-bit version. Please do a system-wide search for bitspeek*.dll. Delete everything you find and then install the latest version from our download-page. If this doesn't work, next step would be to try to clear the registry.