Updater does not update programs

Hi John,

As you requested in topic https://portableapps.com/node/43393, I am making a new topic.
My problem is as follows:
- the updater seems to update my apps, but if I rerun the updater, the apps need to be updated again.
- My PortableApps folder is located within my My Documents folder C:\Users\abcdefg\Documents\PA. The Portable Apps are located in the subfolder 'PortableApps'
- I'm running Windows 8.1 64-bit

Running PA as admin does not solve the problem.
The problem started to occur about three weeks ago, I think.

Thanks, Ernst