Within Picasa 3.5, image tuning changes (e.g change fill light) to pinned pictures are mis-applied to the wrong picture. Happens only with pinned pictures not with regular library pictures. Happens with these tuning changes: fill light, highlights, shadows, color temperature. Does not happen with crop, straighten, or retouch.
Replication scenario: open pictures in Picasa 3.5 and pin two pictures to photo tray at bottom of screen. Open first picture, change fill light, change to 2nd picture, note fill light changes are applied to it, not the first picture.
Picasa 3.5.0 (Build 79.81, 0)
Windows 7 Home Premium 64-bit