I'll try not to be confusing.
The file is missing, as well as the POIs; however, when I open the 500 from my laptop and look at the files, they are there, along with the points I tried to upload. Also, when I go into, say, the internal memory, then Geocaches (or any other file), there is no option to create a new folder, only Up One Level.
The weird thing is I did manage to upload a couple POIs after a bit of wrangling, and the unit worked perfectly. Now, it's not uploading.
I realize this is difficult if not impossible to do this way, but I do appreciate the help.
First I enter the info from this site into Geocache manager, then I press the send to GPS button (or whatever it's called). I create a folder under Geocaches. The hit OK, the computer says the upload was successful, but when I hit Goto on the 500 and select Geocache Pts., the points and folder are not there.