I have the same issue, seems like any area described as a "nebula" has these blinding white areas that not only hurt my eyes, but causes my FPS to nosedive into slide show mode. So far I've noticed them in the Azure, ChoS, T'kanis nebulas, as well as Borg encounters.
Having ZERO fps issues. They look interesting, but hardly fit to appear everywhere.
Turn down your bloom, it may help your eyes.
Just tested "Empire Defense: Romulans" with bloom, light and shadows turned completely off and the white blobs still sent my FPS to hell. Makes it impossible to play the mission efficiently.
My hardware specs are not the problem, as I've had no FPS issues in the past with any of the MMOs I play, up until these white blobs started showing up. I wouldn't say everywhere, but I have seen them in a couple maps.
I actually think it has something to do with asteroids... I only ever see these giant blobs in maps that have asteroids o.o maybe it happens with other space objects... But I've seen them in multiple deep space encounter maps.
Suffice it to say, HUGE frame rate drops from them.
Edit: Wasn't there a recent patch note regarding a change in Bloom Intensity? I wonder if this change had a negative effect on space object generation. Hmm~