As I have mentioned in a couple other threads, I am doing some work to optimize the site for search engine rankings.
Without going into detail, there are some things inherent with phpbb forums that prevent search bots from adequately indexing the site and finding all the content.
I'll know more soon, but I think that most of the changes will only effect guests, or users who are not logged in. The search engine spider bots are not logged in and crawl the site as guests. The mod I'm having done will eliminate a lot of non-essential information from the page for the guest view. The extra information, in terms of search engine rankings, reduces the value of the content on the page and can cause lower rankings.
However, if you log in, you should still have all the same features.
As a side note, whenever you start a new thread, please use descriptive subject lines. Not only will this give you better answers, but subject lines containing keywords yields better search rankings as well. For example, instead of having a subject like "help, me I don't know what to do..." you might use something like, "Help me with my mustard algae problem." This would be a far better choice as it would include the keywords mustard algae and would also let the reader know what issue you are having without having to get into the thread.