Hi Matthew, from the manual, an input reference of 1080p25 is supported on the Carbonite Black Solo. May I know what is the video format set on the Solo? Note that if the reference signal is 1080p25, the video format that the switcher will run is either 1080p25 or 1080p50.
Do you know the firmware version running on your Solo? If it is not v2.0.3, you can download it at the following link: https://www.rossvideo.com/support/software-downloads/carbonite-black-solo/
Also, you can contact Tech Support (techsupport@rossvideo.com, https://support.rossvideo.com/hc/en-us). It is free, and they will step through this with you and get to the bottom of it.
#Carbonite