Oops, I have an unexpected problem at Dreamstime!
This morning I saw I sold an image "under exclusivity" for $ 0,60.
?  I do not have any exclusive images at Dreamstime!
I checked, and about 20 of my newest pictures are exclusive. 
When I un-tick the exclusive boxes and submit, they're exclusive again (all the tickx re-appear).
I immediately mailed Dreamstime about it, and asked to refund the customer (a FULL REFUND of 0,60 dollars  ) but I have no idea what to expect now.  Hope they don't consider me as a cheating photographer now.
Any-one else had self-ticking boxes there?

well, it certainly isn't a general glitch, as i just uploaded some last week and had some new approved online. but just to make sure, i went in to management page to see that the box on the right side, under  the margin exclusive image are all empty.
all is well with mine.
as for your case, i hope you get a response from support soon. it's good you acted right away to contact them.

I just got a reply by Dreamstime :

"Dear Anyka,
Thank you for contacting us.
We modified the download record and removed the extra $0.10 from your account.
We thank you for letting us know.
Kind Regards,
Erin Vandivier
Customer Service Manager"

I also checked all recent files and changed them back to non-exclusive.  It appeared to be every photo of 1 single batch.  Must've been a just-once-bug?  I thought one could only tick the exclusive box on a per-photo basis?  Oh well, it's solved now.