The current plugin adds a iframe directly after the body tag that makes all links in the browser frame to not function. If you scroll down, beyond the current browser display, the links work.
This is obviously due to this iframe.
Uninstalling this plugin corrects the issue.
Here is an example of the code that is inserted:
<iframe id="a2apage_sm_ifr" height="1" width="1" style="border: 0px; left: 0px; top: 0px; position: absolute; z-index: 100000;" transparency="true" allowtransparency="true" frameborder="0" src="http://static.addtoany.com/menu/sm10.html#type=page&event=load&url=http%3A%2F%2Fwww.gotrecovered.com%2F&referrer=http%3A%2F%2Fwww.robbury.com%2Fhome%2F"></iframe>
The plugin worked great until a few days before this posting.
No I did not go into deep analysis of this issue. The easy fix was to uninstall this plugin and install something else.