If your Strymon pedal is NOT detected by Nixie, the Device Details window will provide you with options to help with getting your pedals connected to Nixie.
If you see this window, and your pedal is connected to your computer via MIDI:
***NOTE: Clicking Detect Devices or Detect Hardware will erase all items from the History window for all currently connected pedals. An Auto Save for each pedal will be automatically created in the Preset Collections window. The Auto Save includes all changes that have not yet been written to the device, but will not include the undo history.