Room temp is best...it keeps the gelatin from becoming Jello.
Since it's been in the cold for a time take it out to warm to room temp. It should not endanger it in any way.
You should start seeing results in about an hour or so. Overnight is good, but 2 days is better. Then you'll be ready to bottle/keg.
Try not to syphon any gelatin with the brew, but if you do it'll fall out again.