While the Avalanche GUI will export the project with all the correct IP addresses/ports for the equipment in use, you must be careful of any changes to the test.tcl and config.tcl files after exporting as there are multiple references to the IP address and ports. If you change only a single instance the test will error when you try to run it.
Please use an editor such as Komodo Edit (www.activestate.com/komodo-edit) to search through the files and ensure all the Ip addresses and ports are defined correctly.