I have been a long time user of C1 Pro (10+ years) but I am tearing my hair out at the moment with 8.1 - I have wasted 3+ hours so far this afternoon trying to get it to run properly.. I have intermittent failure to load (just hangs), or it tells me there are no image in the folder (even though it flashed a few up first, different ones each time). When I am able to exit from that situation it shows a saving dialog box but just hangs again until I break out with task manager it says it is waiting for input from me and then backup/integrity dialog pops up. I suspect it was waiting for a response