Hi, I have been in contact with Lee on a long term basis as this problem goes back to the very start of first getting Affinity Feb 17ish, it is a persistent but intermittent fault that only occurs when I try a curve adjustment on whatever file it decides to choose, as soon as I activate the curve I get crash message the application (program) closes and a report dialogue opens witch I now just close, some files I can edit while others not, I am not a computer nerd and professional help is expensive, as a long term Serif customer I am reluctant to give up on this astounding piece of kit, how can I upload all this stuff. The original help was to download beta updates and I have lost track of all this, this is the only time I have encountered long term problems with Serif products, I have just edited a file with a curve adjustment among others and no problem but it will return as allways does, the reason I am looking at .NET is that the message was that it is this on my computer could be causing the problem, losing hope now!