Something I did has made it difficult to copy text, that is intended to be copied, such as a link from my web site pages.  Most web pages I visit allow me to simply select text and do a copy and paste.  On my site if you drag the cursor across the text you wish to select, nothing happens.  If I hold down the shift key and do it the text will select.  Is there a setting I need to change to make this easy for viewers?