We are aware of a problem on the Treo 650 with selecting photos. Palm changed the format for storing photos between the Treo 600 and Treo 650. We will have a permanent solution in the next release. Temporarily you must copy your photos to your expansion card then HBlogger can post the photos from there. To copy to the card, select the photo in the 'Pics & Videos' application and select "Copy to card" from the menu. If you use another method to move the files, make sure you put the in the /DCIM folder of the card.
Also, there can be an issue if you have not named the SD Card. With the card in the SD slot of your device, go into the program CardInfo. In the menu, select Rename Card and give the card a name.