File in Use error deleting PDF in Windows 8.1 SkyDrive

I'm using SkyDrive and have ran into an interesting issue.

I'm also using Adobe Acrobat XI Standard

When I save a PDF file to SkyDrive in Windows 8.1, it becomes difficult to delete the file via the file explorer

I get a "File In Use" error - "The action can't be completed because the file is open in another program" - yet it's not.

It gives me the option to "Try Again" and I click that about 4 times, getting the same error, and then after the 4th time, it allows the deletion of the file.

If I were to save the PDF to my desktop, it deletes immediately.

It seems to only be in the SkyDrive directory where it's an issue

Other document types do not have this problem.

I am using the standard security within Windows 8.1, and it hasn't detected a virus.

All newly created PDF files are acting like this.  Non-PDF files are deleting properly.

So it's not existing/old files, or non-PDF files.