To get your Stringer Extras working here is how to do it:

1. Type in the command line APPLOAD

2. Go to C:\Program Files\CSS\Stringer 2013\Programs and select  STRINGERc3D2013-64.LSP and click on load

3. Go down to where it says Start-up Suite and click on the suitcase.

4. Click add and go and find that same file again and click on open

5. Close the start-up suite6. Close APPLOAD

In the commandline type in HD from the stringer Extras menu and see if it works.
It should startup every time from here on hopefully