Here's more info on the problem. I created a folder with an OCAD map and several subfolders, including subfolders containing the background maps. I copied the entire folder into a shared Dropbox. Then I downloaded the OCAD map from the shared Dropbox online to my desktop. I wanted to open the file and relink the background maps before sharing with my clubmate who is also working on this map. But I can't get the file downloaded from the Dropbox website to open. When it's a question of missing background maps, the OCAD file normally opens, but with a series of error messages asking if you want to hunt for the missing background maps. But in my current annoying situation, I can't get the map to open at all. No problem opening the original OCAD file, though. Only the version sent to Dropbox and then downloaded from there.
I created a new Dropbox un-shared folder, "test," to see if that would help. No good. I even tried that old standby, turn off the computer and reboot. No luck. I'm using Windows 7, Firefox, OCAD 10. Nothing custom or unusual.
If anybody wants to take a look, here's the "test" Dropbox:
https://www.dropbox.com/sh/rx6a67vk0czbf0u/AACYLQc...to tRicky: I did create several custom symbols and colors in the OCAD file. (I don't know what a non-ISOM symbol is, though.) Is there any way to see what size the files are on Dropbox? I'm using the free version of Dropbox, and the only info the Dropbox webpage gives me is the file name, kind, and when it was last modified, so I can't tell if the OCAD file is just an empty shell, with the right file name but no guts. It's certainly acting like an empty file.