MicrostockGroup

I usually resubmit the shot isn't trivial. Given the usual vagueness of FT rejections, I downsize to IS 'Large' size (5+MP) if needed/possible and resubmit after a few days. I'm going by my gut, but I think that more than half the time the image is accepted.

Now if it sells, that's another story ...

Almost the same thing just happened to me - 8/10 rejected for being "too similar". I got a laugh out of it though - the 2 that were selected were the only real similar ones of the bunch!

Yup seeing weird rejections with Fotolia too... they must have hired someone (or several of them) with little experience... yet (hope this will improve soon).
Had an image of Notre Dame de Paris cathedral (daylight, fragment, garden view) rejected for "no property release"! Duuudes... check out when it was built.... Having said that it happens with every agency once in a while. They hire someone new, they decide to change their standards and some reviewers would take it wrong (like noise issues with Shutterstock a while ago when they were mistaking pixels on their monitors for noise:))
It's kinda disappointing that they sent you this standard general reply meaning basically "bugger off". But again they are not the only ones to do it. Some agencies don't reply at all - i guess they get way too many notes of the kind, and most of them don't make much sense. So, when some real problem comes up they just ignore it like the rest.
My advice would be - sit on those images for a month, then look at them again. If you still think - wow these are nice, they should have been accepted - then resubmit.