I got this reply from help@seomoz.org:
Your request (#41376) has been answered! See the comment history below. If you're not quite done with this ticket yet and want to add a comment, please reply to this email and the ticket will open back up.
If you wrote us using an SEOmoz account email, you can also view your ticket here: http://seomoz.zendesk.com/tickets/41376
Aaron Wheeler, Oct-27 14:03 (PDT):
Hey Tom,
Thanks for reaching out about this, and I'm sorry you're not seeing your links in OSE. It sounds pretty frustrating, and totally understandably so. As you know, we have made some updates to our crawling for Linkscape - sadly, with a few hiccups. This is the first quarte including the new metrics, which is why you're suddenly seeing the changes. Our new crawler is built to be fresher, but it is going deeper into domains, and, unfortunately, not visiting as many domains. This is probably why links from those domains aren't getting indexed. Domains with a high mozRank are getting crawled deeper, but domains with middle to lower mozRanks are not getting crawled. Our top priority now is to get the domain diversity back up to or better than that of our last quarter updates (as was originally designed) so that we should have many more inbound links. If you're interested, here's a link to the blog post about the update's metrics (it sounds like you may have read this): http://www.seomoz.org/q/link-analysis (scroll down to Kate's answer).
Also, just to be completely transparent about the update, you may see “questionable” links with weird file extensions - this is due to the crawler reaching much deeper into sites where there are more download links. We are looking into fixing this bug as soon as we can so these won’t be counted as links.
I hope this helps explain the changes. We are so sorry about the inconvenience and are focusing our efforts right now on getting this fixed! I wish there was more I could do for you personally, but at the moment, it's a matter of waiting for the index to expand. I've closed this ticket for now, but please let me know if you have any questions or if there's anything else I can do to help and the ticket will open right back up.
Have a great day,
Aaron
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Aaron Wheeler
SEOmoz Help Team
http://www.seomoz.org/team/aaron