Every time I click a TXT or PDF file it opens the file and STILL opens the "Open" dialog box

I have several TXT files I have that track some info for me. Used to be, like in any OS, I could just double click it and viola, there it is in the text editor. Ever since Mountain Lion, I open it and it opens fine, then on TOP of that I get ANOTHER open dialog box from text edit with the finder window to let me pick a text file to open.

I ALREADY opened the file I want so i certainly don't need another unasked for dialog box to open every time. Same thing with PDF's. Apparently just about everything that opens with preview or text edit does this.

I must be missing something since this clearly shouldn't be default behavior. Anyone have something somewhere I've missed that will stop text edit or preview from prompting me for a file location to open when I've already opened the file I wanted in the first place?

Thanks for any insight.

John