Illustrator :: (CS6) Align With Guidelines - White Space On Artboard

I have been using CS6 for about a month now, and all of sudden I started having an issue with alignment (and sometimes with distribute evenly command).  Basically, anytime I try to use align center or edge (horizontally or vertically) with any object(s) and guideline, objects as well as guideline that I selected disappear from the artboard (white space) -- so I zoom out to get the entire workspace (gray area) view, I find objects ending up somewhere way beyond the white space and the guideline at the very top of the workspace if I used align center horizontally,  or the guideline being at the very left of the workspace if I used align center vertically. I made sure that align to: selection is selected, but it appears that it yields same results whether I choose align to artboad, or align to key objects.  I use CS6 on my computer at home, but I haven't had any issue with this yet.