I'm having this issue simply trying to highlight sentences in a PDF. Is this app not optimized for stylus input? Seems to work much better if I just use my fingertip, but seeing as I swap back and forth between Skitch and Penultimate when doing my studying, I keep defaulting to trying to use my Jot Pro. Also, it's -very- laggy when selecting between scrolling and highlighting tools. Just wondering if this is normal.