Guys, how about trying it for yourselves? Using another camera, shooting into something like and LED light with f22, shoot stright into the light, I just tried it with my LED torch, E-PL2 has, so does my old Canon A710IS as well as the XZ-1, though E-PL2 is more pronounced, if the other camera also has it, its probably just not an E-PL2 thing, using the 17mm its not visible, using the 14-42mkii on my E-P1 there is slight
How often do you shoot into light sources with such small apertures? Rather than letting this trouble you, think about it, has the E-PL2 let you down in any other way? I've shot into light sources before, but usually at an angle so I never get these spots. If you find that the camera has not let you down in any other way, don't let this red spot thing stop you