Not bothered to take mine off either now that it seems to have reverted back to winter. Plenty time for the weather to improve again and have already taken the opportunity to give it it a good 'airing' when we had that little bit of spring weather.
Ok, thanks for all the replies. I was just worried about letting warmer air in (or a warmer day) and then locking it all up again. I think I'll wait a while longer then.
Never mind getting the cover off, get it out and used now! And, once the cover is off, just look for dull spots down the sides. We had a Protec on ours last year, and it looked like someone had been at it with a buffer in places. It had worn the gloss off here there and everywhere. Never again for a cover.
Its no surprise that that Protec absolve themselves of any liability unless you have made sure the cover doesnt move or flap in any way - which is nigh on impossible in a decent wind. Hence 'blotching' occurs.