Rhapsody

One thing to be careful about is if you have overrides and theme customizations. I debugged two problems after transitioning from PS. One with Mail Alerts not sending emails and the other with PDF causing a database exception. It turns out I had files in the original PS Community Theme customization and some overrides I had that were the problem. Use the debug feature under the Advance Parameters, Performance to help find any problems. I was able to update the files so all works fine.

Reading this I had a similar problem. I ended up resetting the four dashboard modules and the problem was fixed. BO - Modules -> Dashboard (on left menu) shows the 4 dashboard modules. Click the dropdown on each and select Reset

Nemo has a blog post that works for preventing these types of spam. It was written for PS but I am using it successfully in TB 1.0.8 as an override for ContactController.php http://nemops.com/blocking-spam-emails-in-prestashop/#.Xm7Zx6hKiUk