Issues Opening PDFs with Reader 10.1.5

Since upgrade to Adobe Reader 10.1.5 our users have had problems opening PDF files. Most times it takes at least 5-6 attempts at trying to open the file and sometimes it just never opens. It doesn't matter if the PDF is in an email, local, on the network or on the Internet.

For now, I have put them back on 10.1.4 with no issues. Any ideas if this is a known issue with 10.1.5 and if there will be a patch released soon?

Windows 7

Thanks!