Correct. Spaces are no longer allowed in users names. We had a few too many people not realizing they added two spaces to their user name when they registered and then shoot of nasty grams to me about something being wrong. So, to fix it… NO SPACE. :)
The search engine searches all posts. If anyone knows about phpbb, it was the search index that was one of my major headaches in tryng to bring the forum back online. The forum’s search engine should work even better now.
Not sure about your post history question. ALL old posts are attributed to historian due to the loss of all registered user data. It’s like at the post office if everyone ripped addresses off the envelopes; we had all the letters, but didn’t know where to send them or who sent them.