We've noticed similar issues as those mentioned in this thread. Specifically, deltas between the most recent URL update, and what bright cloud actually says. Also, we see recently that lots of URLs are not found locally and the firewall is consistently going to brightcloud for dynamic updates, in several cases the firewall has stopped routing all traffic until it gave up trying to get a dynamic categorization.
After going to version 4.3 and coincidentally changing our ISP seem to have brought on an avalanche of "not-resolved" errors.
I note though that there is a mention of a 5 second response time requirement from Brightcloud before this verdict is delivered. Hmmm...
I have made requests in the past to Brightcloud for URL re-categorisation and have received decent responses. However I agree that Brightcloud is not proactive ( not quick enough in this regard) in it's categorisation work. We had to send a whole list of IP addresses that microsoft (and yahoo) use to host their skydrive files so that students could download their work. I find that when MS / Yahoo add to this pool we had to keep sending these to Brightcloud.
I have seen other more obvious ones not being categorised properly as well.
We use custom URL categories to get over this. We have set up categories such as universal allow / deny , staff allow / deny and students allow / deny. These are then tied to policies that filter pages for these user types.
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