It may be just me, but I noticed that when I was importing a png file through nutcracker onto my matrix there is an issue if you update the picture file and call it the same name. I think I have also had the same issue with jpg so I don't think it is to do with the file type. I load the picture.png file and play effect. All works as planned. I then decide I need to change picture.png to make it look better. Do this in paint and save it as picture.png (overwrite original file). Go back into nutcracker and go to the filename tab and select file (so effectively select the same file as shown already in the directory box in Nutcracker), click ok. Then play effect and get same effect as original, not the updated file. I have tried selecting another effect (eg bars) and running that and then going back to pictures and still old file. I have to shutdown xlights and reopen it to get new file. I'm using version 3.4.11, so my apologies if this has been corrected in the 9 versions since. I have not checked. I'm not stressed and not complaining. Can easy work around it with new file names. Just some feedback on what is a fantastic program. Thanks Sean and all the other developers.