Same here in version 2.44
Edit: OK, found that I'm not using the latest version. I downloaded RealBench from the "downloads" section of my motherboard (Maximus X).
Downloaded the latest version (2.56) and now when trying to do an upload, I get "Upload Failed! Error:", but there's nothing beyond "Error:".
Maximus X Hero (WI-FI AC) | 8700K | CORSAIR Vengeance LPX 16GB (2 x 8GB) | Nivida GTX 1080 TI | Noctua NH-U14S cooler | Windows 10 64 bit
All setting at stock except XMP memory profile.