Picasa does not play well with Thunderbird Portable

For a variety of reasons I prefer to use some portable apps on my computers. Today I moved from Outlook to Thunderbird Portable and am extremely happy with the change except for one problem.

I am trying to send photos from Picasa using TB. Picasa "sees" TB as my default email program, but when I hit send something happens but Thunderbird does not receive the photos.

Any fix to this issue?

k