Windows 8.1 64-bit: PDF icons in File Explorer fail to show

On my Windows 8.1 Pro 64-bit it seems impossible for File Explorer to create thumbnails of my PDF files. 

I use Adobe Acrobat X as my default PDF application.

I did some thorough research to find a solution. I expected a simple fix, but the problem persists hence this post.

There is only one work-around that works (from Adobe Community link below):

1. If you click Open in Acrobat
2. In the Explorer window select show large icons
3. Thumbnails will be created which will be visible in File Explorer.

My problem with the work-around is the extra work required to generate thumbnails. I have many PDF's whose front page thumbnail I use to select my file of choice.

What fix have I over-looked?

Cheers.

Dave---

I applied all these solutions:

Icon cache rebuildRemoved IconCache.db in %localappdata%

File Explorer > Options > View "Always show icons, never thumbnails"= off

Default application to open PDF Set to Adobe Acrobat in File Explorer

Default PDF handler set in Adobe Acrobat:

1. Click Edit> Preferences… 
2. Click the button Select Default PDF handler
3. Click Apply. Acrobat will start an installer and processes the configuration changes.

Checked system with sfc /scannowNo problem detected

Removed thumbnails with Disk Clean-up

References:

1. http://www.pretentiousname.com/adobe_pdf_x64_fix/#downl
2. https://forums.adobe.com/thread/949406
3. http://www.sevenforums.com/tutorials/49819-icon-cache-rebuild.html