I have a Oregon 450 for a few months, and I'm copying+pasting geocaches and pocket queries from the PC into its memory and everything was working fine. But a few days ago I turned the GPS on, and I couldn't see any geocache (the day before it was working and I didn't change anything). I thought that for some strange reason they got deleted from its memory, so I connected the GPS to the PC and... all geocaches were there! My PC can see the geocaches in the usual place in the GPS memory, but the GPS doesn't see them. The same with any other waypoint. Only photos and maps are still there and working. What happened? Thanks for your help!