I have Reader DC installed, which of course everyone can get.Like I said, I have not read anything that indicates Acrobat is a requirement for PDF preview with LCD.I might take this up with Adobe Support.Scott.

Interesting.I've used ES2 for many years and never had the problem. It happened immediately upon installing ES4.Seems to me that LCD should not rely on Acrobat being installed; I have not seen that mentioned in any system requirements.So even though I have Acrobat 10 and 11 available, at this point ...

I found a number of threads on this reaching back two or more years, but no definitive answer.I have a newly installed LCD ES4.I  have made sure the Adobe Reader add-on is enabled in IE.Reader DC is installed. (I can also install Acrobat Pro XI if needed).Still, the PDF Preview (F5) command is greye...