Hello
Yes, there was an "upgrade" which flies in the face of O.V.coms mantra if you ask my opinion.
It was done for reasons of security apparently.
I dont think there has been a "loss of old threads" however many links are broken, if you have trouble with a link in a thread, post in that thread & the link will most likely be fixed. (or do the search and post the link for others)
Also there is a new feature at the bottom of each thread which links to similar threads
its random but sometimes points the way.
of course the forum still has a search feature and you can put in key words like Dreamweaver or 2004 if your other keywords do not bring a result.
b.t.w I have not searched but am sure I've seen it in the forum before.