Here's something I posted to the Delorme forum that worked for me with my PN-40.
I may have found a temporary work-around if you import your gpx file into T8 to load your PN.
1. Open the gpx file in notepad.
2. Select Edit/Replace.
3. In the Find what: field, insert "http://www.Groundspeak.com/cache/1/0/1" without the quotes.
4. In the Replace with: field, insert "http://www.Groundspeak.com/cache/1/0" without the quotes (delete the "/1" at the end).
5. Click the "Replace All" button.
6. Save the file.
7. Import the revised file into T8 and perform a normal exchange to the PN.
It seemed to work for me, but I haven't done extensive testing. I'll monitor the forum for more results. Good luck to all of us as we wait for GC.com and Delorme to work out a permanent solution.