When I got my computer, a number of years back, it had adobe reader on it and everything was fine. Then I had a need to modify *.pdf files. So I had our IT department install Adobe Acrobat Pro 8.26. And everything was fine. Then I received a request to update the reader to reader X. That is when it all went to pot. My AutoCAD quit working and my Acrobat would not start up. I figured it was the reader X that caused the problem. I unloaded reader and then my AutoCAD would work. However, Acrobat would not start at all. I had to re-install acrobat to get that to work. I save copies of CAD drawings in *.pdf and other files as well. I keep them in a folder on my desktop for quick reference. I have the files show up in thumbnail in lieu of in detail. However, now the newest or recently modified *.pdf files do not show up as a thumbnail. The old files still show as a thumbnail. The new or recently modified *.pdf files just show as a large Adobe logo. I know reader X did something. I just don't know what or where. Can anyone give me a hint as to how I can get my thumbnails back? Calling the support desk in India was a complete waste of time. Since Adobe 8 is an older program their Adobe 8 answer books were thrown away.