... but not the solution.
I'm wondering if any of you guys can hep me out with this mess. I operate a forum with PR5, 160k posts, listed in DMOZ and Yahoo. Everything was going great, until I made a big mistake. I changed the default cut-off date for threads from "Last Month" to "From the beginning" AND installed the vBa Gallery all on the same day. So all of a sudden, Google could see about 3x more pages and this caused a serious drop in rankings. The next day, I had 2x less referrals than before and never recovered. On the contrary. About half a year ago, I had 3800 referrals per day from Google. Three months ago, I had 1700 referrals, and the last month, I had only 1200 referrals. I've tried changing many things (like setting the cut-off date back), but it just keeps getting worse. More and more pages are in the supplemental database.
Have you ever experienced a similar situation? What could I do to repair the rankings?