The refrigeration storage is for nicotine VG/PG to keep nicotine strength from dropping over time, not for mixtures once you add flavor. Some flavorings can (as you know) solidify a bit in the fridge. As long as you keep it away from sunlight and too much heat your mixture won't really lose anything unless you don't use it for a month+.
Really? What happens after a month+? Everyone that I buy from always says it's good for 12 months. More if you refrigerate it.