ok – here my recipe: I open a pdf document in safari,
example:. http://epaper.derbund.ch/pdf/2012_2_BVBU-002-1604.pdf
and then I want to copy a word. I get a beep and there is nothin in the clipboard.
In the mean time I uninstalled Acrobat Reader - result: opening pdf documents in Safari resulted in a black window.
Then i tried to reinstall a earlier version of Safari (first from Time capule, didn't work because you can't delete Safari or move it out of the programs folder. Then I tried to use an earlier version I had on my laptop. Did not work either.
Finally I reinstalled Lion - did not help any. And then I reinstalled Adobe Reader - did not help, but from inside of Adobe Reader I could upgrade to version 10.1.3. Now I can load the pdf-documents but I can still not copy text.
On my laptop I still have Safari 5.1.3 installed and there is no Adobe Reader and there everything works as expected.
I did not pursue the <Click.to.app> uninstallation.
Maybe I should try to make preview the default opener for pdf-documents in Safari, but I did not see how to do this.