Problems with orders. I created another topic about it. One customer placed and order. Received money in PayPal (use standard payment method) but nothing shows on dashboard. Unless I go to "Sales" --> "Orders" and filter them by "Missing Orders".
Do you have your IPN configured properly?
OC 2.3 in indeed pretty bad in many terms. In my opinion, it's the worst OC 2 version, which brings nothing new, but gives you headaches. Tons of people complaining about it.
I'd suggest you to use 2.1 or 2.2 instead. Been using 2.1 myself since its release, had absolutely zero issues despite that my site's having tons of different modifications.