When you create a map; close udig and reopen it you sometimes get "Unable to Open Map" errors.
One reason for this error is ":" in the map name (as these are not valid in Windows file names).
I have fixed this for ":" but we might want to get a list of all the invalid characters to ensure it doesn't happen for other characters as well. Does anyone have a good reference?
I also suspect there are other reasons for the "Unable to Load Map" as well but I haven't tracked them down.