Hey Ramblurr,
This has been updated in the developer line. There is an interesting issue with mysqli_connect. In some PHP versions the $host param will except the port as part of the host i.e. "localhost:55" in other versions only the $port parameter works. So for the fix I added a specific port field to support both methods. Can you let me know if this works for you?
If you can give the developer version a try it may have your fixes for the issue your seeing. The very latest version (0.5.19) can be found by following these instructions:
-> Browse to http://wordpress.org/extend/plugins/duplicator/developers/
-> Look for the section "Other Versions"
-> Click on "Development Version" and download the zip plugin file
-> Uninstall your current version and install this one
Let me know if this solves your issue...
Thanks