Yep - b/c think of it like a path....
Picasa > Element thumbnail > Hard drive F to find it
But when you move it to another location and then pull up the same Picasa database to find them on that drive - it's still trying to findn Drive F as above when the drive changed to E; THEREFORE... it thinks there is nothing there to find or just can't find it.
Here is a link on how to change the letter of a hardrive... if you can get them to both "act" as the same drive... (the one that works right now so you don't have to redo your Picasa); that should work for ya
http://forum.tweakxp.com/forum/Topic...de=1&#bm156967