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I am experiencing a problem with Affinity Photo sufficiently severe as to make it unusable and sufficiently odd as to make it very hard to describe. So to save you all asking questions that I may have addressed already I shall take you through steps to date. This will be longish. The problem manifests itself as a severe re-draw delay. In its mild form it can cause jerky intermittent re-draws as the cursor moves. In it’s severe form NO redraw occurs at all until the pen is lifted from the slate. In both cases the cursor is continuously redrawn and moves smoothly but the operation being performed is not being properly re-drawn. The severity changes from tool to tool. It is very severe with selection tools, transforms, crop and eraser but only very mild with the brush tool. (See attached video screen capture) What made this particularly baffling is that it only happens sometimes. Sometimes I would open Affinity Photo and all would be fine another time I would open it and all would be dysfunctional. Sometimes it would even switch from functional to dysfunctional while open. I have an 8 core MacPro with 28GB of RAM and a fairly high end Nvidia GeForce 680 video card with 2G of VRAM. My OS X 10.10.3 and the Nvidia drivers are all up to date. Swap files and VM are on a fast SSD. At the time I tested this problem Affinity Photo was showing Memory Pressure 0%, Memory Efficiency 275%. So it didn’t look like a video or system resource problem. The first thing I did was to reinstall Affinity Photo. No change. The next thing I discovered was that the problem was confined to when using the Wacom Intuos Pro. With the mouse being used re-draws were perfect. I checked the Intuos drivers were up to date and just for good measure re-installed them anyway. No change. Given that my Intuos works fine with all my other software this begs the question whether it is the Intuos or Affinity Photo’s handling of it that was causing the lack of redraw. What still was baffling was why the problem came and went intermittently without apparent reason until I discovered it is image related. Certain images will trigger the dysfunctional redraw and with certain others all works perfectly! Whatever is going on it goes right back to the source image. I can open a brand new JPG with nothing done to it before and it will trigger the redraw problem every single time. I can open another brand new JPG and all works fine. This could have been chance so I did a high number of loads and reloads with a small number of JPG’s and the results were absolutely consistent. Certain JPG’s were “rogue” on every load and certain were “clean” on every load. It seemed that certain JPG’s had something in their make up that was triggering the problem in Affinity Photo. At this point I discovered something else. If I loaded a rogue problem causing JPG into Affinity Photo and immediately hit Save without performing any operations on it I get the message “The document contains non-pixel elements. Would you like to save the document flattened to pixels, or save as a new document?”. If I loaded a clean non problem causing JPG and did the same thing I did not receive that message. I know this has been listed as a bug elsewhere and I thought it had been dealt with. Anyway it would seem that this and the failure to re-draw properly seem to bear some relation. Having discovered this I tried opening a rogue JPG that would not redraw and saving it out as Affinity APHOTO and also exporting it to JPG, PNG, TIFF, and PSD. All five when re-loaded into Affinity Photo still refused to allow proper redrawing. I then loaded the original rogue JPG into AffinityDesign and all the drawing tools which caused problems in Affinity Photo worked fine in Affinity Design in PixelPersona. The problem these files are causing appears to be uniquely Affinity Photo. Almost done! My last test was to load a rogue JPG into Photoshop (CS6) and save it out as JPG and PSD. When I open these in Affinity Photo the rogue element is gone and all the tools work perfectly! Whatever is present in these problem JPG’s that is triggering the lack of proper redraw in Affinity Photo is cleaned up by re-saving from Photoshop. So at least I have a work around. But this is a very severe problem that renders Affinity Photo with a Wacom slate completely unusable for certain classes of file. I have no idea what might be the trigger here but I can say that all photos taken with my Canon 6OOD and my wife’s little Canon Ixus are rogues which cannot be processed properly by Affinity Photo because of dysfunctional redraws while photos taken on my little pocket Olympus process and redraw perfectly as do files previously saved by Photoshop. Sorry to ramble on but this is so bizarre ………….AffinityRedraw.mov