09-25-2008, 06:24 AM
Are you using the Touchup Text tool on the Advanced Editing toolbar? It enables you to select, copy and edit text in editable PDFs (although only one text line or block at a time). Its icon looks like this: 
I tested a PDF with highlighting over here, and Touchup Text enables me to select, copy and paste highlighted text.

I tested a PDF with highlighting over here, and Touchup Text enables me to select, copy and paste highlighted text.