In the second post under this topic I did mention some details about (your) old data, but the notes there might not have been clear.
Old (pre-split) Private MessagesI'm assuming you want access to your old private messages. To get these, you can log in at the main site,
http://inventorspot.com/user, using your current forum credentials and pick up your old private messages there. If you were signed up with an account before the split, you will have an account at both sites with the account and password name at the time of the split.
When we split the forum from the main site, the old private message functionality remained with inventorspot.com. All of the original information is still there, just in a "different" account.
Technical Reasons for the Upgrade and SplitThe details of the reason for the split are kind of complicated. Originally, we tied together the account management systems of two different web software packages, Drupal and phpBB, to try to make a single site with all of the features that we wanted. The main site, with its content management features and the forum, with its corresponding features. However, the integration package between the two was becoming increasingly hard to maintain and was preventing us from updating either software package with much needed fixes. Splitting the two simplified our lives, allowing us to (more easily) upgrade the software packages independently. One ball to juggle instead of three.
It's a technical reason for the upgrade, but the new setup allows us to deploy our efforts towards more productive ends.
Image UploadsI've had a (surprisingly) hard time locating an image upload package for phpbb 3.0. Many of the packages haven't been updated for 3.0 yet, which does leave people in the gap between an unsupported version and a version that doesn't have everything yet. It's definitely on my radar, and a priority.