That's rather strange. I've never seen any frame in my images.
Anyways, this only proves that Olympus lenses vary considerably in quality and you gotta check them carefully before you buy one.
It's a known problem. I tried several lenses, and ended up with just one I liked most. However, I still have to close the aperture up to 6.3 to make the left corner blur go away.
By the way, the Olympus 45mm blurs in the right corner :)