After still seeing problems with the blogs on the network I did some more house cleaning today, then upgraded our network from the wordpress mu 1.5.2 to the new 2.6. You will find some widgets and theme customization and probably some themes that will not work with the new platform. Life is fun! 
Please send any problem reports to support@trafficblognet.com
I left out FireStats of course. Most all of the other plugins that have been working are still available but probably turned off on your blog. Simply go to "Pugins" on your admin menu (left side in the blue bar on top) and turn on the plugins you want to use.
I have noticed that some of the plugins like Headspace seem to work better
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