Problem with NoteTabPro

After switching to a new computer, I find that when editing a file in
NotetabPro and clicking on the icon to see the file in a browser, the
program opens up Mozilla and the page in the browser is blank. The
same thing happens when I click the icon to see the file in a
different browser. Does anyone know how I can get NTP to open the file
in a browser with no problem?

Tia