OK, brogers_1, here's my attempt:
- Access Sharepoint 2010 UI 4(version 14.0.6137.5000) from computer with OS Windows 7.
- Enter a search term and search for any PDF.
- Wait for search results to be returned.
- Double click on a PDF and try to open it with product adobe reader of version 11.0.05xxxx.
result: error message mentioned in this thread.
Right click on any search result and choose Open from the context menu. PDFs successfully open in a new window or tab.