DVDStyler Portable 1.8.0.2 leaving empty folders behind

The latest version of DVDStyler Portable is creating the following folders but does not remove them when closing the program:

%USERPROFILE%:
C:\Documents and Settings\{username}.thumb
C:\Documents and Settings\{username}.thumb\fail
C:\Documents and Settings\{username}.thumb\normal

C:\Temp
C:\Temp\dvd-cache

While it's not a big deal I was a little irritated to see that happening with a a PortableApp.