If BIAS Amp shows up as an empty (black/gray) window with the UI (user interface) missing in either standalone mode or in your DAW, please follow the steps below to troubleshoot the issue.
1) Find the BIAS Amp folder in your Documents folder.
2) Manually move the entire BIAS Amp folder to another location (e.g. your desktop)
3) Re-launch BIAS Amp or load the BIAS Amp plugin in your DAW. This will force BIAS Amp to regenerate its data files.
4) The UI should now return as you open BIAS Amp.
If the issue persists, please send us a support ticket below and an agent will assist you.