and assumed Serviio would pick up the subfolders as well.
Yes serviio will normally pick up all sub-folders, you do not need to specify them individually (as long as the Servio Service has access rights to these folders and all files contained within them).
OK, I did the Windows Explorer Security tab and added Everyone with Full Control. I checked System properties first and it was already set to Full Control.
OK, this is what I was looking for...
Anyway, no change. WMP and PowerDVD 2013 Ultra only get partial results. (win7 and win8 machines same results)
We need to remove all this software from the equation.  What do you see when you browse via Serviio's MediaBrowser (see 
http://www.serviio.org/mediabrowser)?
Windows Explorer works if I go to the folder's folder, but not the movies folders. In fact, Windows Explorer's Movie folder shows the same info as both WMP and PowerDVD show under the folder's folder.
This is further confusing - Windows Explorer can't see these files (how do you know they are there??)!!?
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I am starting to believe we have gone down the complete wrong path with this.  When you say "Movies Folder" do you mean the Movies category in the Serviio menu?  If so, seeing only a few of these movies simply means the metadata for these files hasn't been found.  The Movies, Series, Actors, Directors, etc categories are all populated 
based on the metadata for the file.  Only the Folders category in Serviio shows the files as they are stored, based on file name not metadata.
For example, if I have a file called 
Yes Man (2008) DvDRip.avi stored in my 
foldername folder on my PC (and shows as such in Windows Explorer) then in Serviio this will appear in the Serviio category Video,Folders,
foldername as 
Yes Man (2008) DvDRip.avi.  
If metadata is found for this file, it will 
also appear in the the Serviio category Video,Movies category as the film title - in this case 
Yes Man.
Note that the Serviio Movies category is not a folder on your PC (and therefore you won't find it under Windows Explorer).  Unfortunately it gets confusing as most users store their movies in a folder called 
Movies and Serviio has a category called 
Movies, but the two are not the same thing.
If this is your issue, then it is fixable.  Firstly check the Series category - if your files are a TV series, Serviio may have categorised them there. Secondly, and more likely, is that you will need to rename your files so that Servio can find the metadata for them.  Serviio uses the file name to determine what movie the file contains - generally the file name should be in the format 
Movie Name (year).xxx for a movie and  
Series Name SxxExx.xxx for a TV servies.  Have a read of the 
wiki article 
http://www.serviio.org/component/conten ... extraction and take particular attention to the file naming scheme required for on-line metadata sources.
Renaming your files should fix this issue (if this is it), but you may still have the odd one you cannot get metadata for.  Use the tool 
FileBot to help with renaming those - if you find you need to do this, search the forum for my posts on using 
FileBot to help rename files.