Hi,
I'm having similar issues with my Rock Level 1 badge. I've completed it and it says 100% but remains in black and white. The "Rhythm Embellishments: Add Some Spice" prompts me to mark it as complete, which I have done but no luck.
Not sure what psychology is at play here, but I really want to see my coloured badge. Closure? OCD? :)
Apart from that, I'm enjoying working through the Guitar Tricks lesson series.