I fully exited Dopus. I deleted the foldercolors.ocx, then restarted Dopus.
With the file gone and no files or folders listed in Preferences>Files and Folder Labels, I attach a label to one of the five troubled folders. I look in the Dopus ConfigFiles folder and the foldercolors.ocx file comes back, I open it in Notepad, the folder path appears!. When I delete it, the ocx is empty but when I label one of the folders again, the filesize changes so I don't even need to open the file to check its there.
All other folders in the drive that I labelled previously are okay (labelled pink) and they don't appear in the ocx file or in Preferences - just the 5 problem folders.
Its very odd, because even if I changed the folder's names (which I really didn't want to do as I have constructed a very strict naming system) it still happens. So it seems the labels are attaching themselves to the 'space' that the folder occupies, and not the folder itself. But if thats the case, then why couldn't I change that with these new improvements and override that?
The only way around this was to backup the said folders, shred the originals (not just mere delete), label the backed-up folders in their new location - and then restore them to the original drive! As it was only 5 folders bugging out, I resorted to this - I wouldn't have done that if there were more. So far, the labels stick and no folders list themselves in Preferences or the foldercolors.ocx file, which is good. I will keep an eye on these in case something changes. But I think this way has worked.