Yeah, flashing tank light means the bike is not in "GO" mode.
Two things to look for if it happens again:
1. Flashing green lights at top of LCD. These should always flash when bike is at "idle" but ready to go with throttle use. I thought those flashing green lights would bug me, but I love them. Sitting at a light with a bike that doesn't make noise nor vibrate is slight disconcerting...those lights let me now the bike is still on and ready to go, hopefully, when the light changes.
2. Speedo. If you see "ON" instead of "GO", this means bike is on, but won't accelerate.
If the green lights aren't flashing on the LCD, look at speedo to see if red Kickstand light is on. Or if you see the notation on the LCD that "headlight off" or "cycle throttle switch", which is the kill switch.
The kickstand magnet can sometimes be a problem on bikes.
Gavin