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Hi, I have a pretty serious problem in multiple files. The problem seems to be caused by an embedded image (.pdf) which contains around 1000 small dots - the problem is not always there, but all the .ai files which have the problem contain these embedded images. On-screen, the appearance (both in the main .ai file and the embedded file in its own tab) look fine when zoomed out far enough, but as I zoom in big 'blank' patches appear, as if a white rectangle had been drawn over a section of the dots. The position of this isn't fixed: at different zoom levels it will be in different positions. And it also is't consistent in what is cut out. So it has the appearance of a rendering issue. This problem starts seemingly at random: one file was fine for months of editing and then today it gave me the bug. Once it appears I cannot get rid of it. Reloading the embedded file, copying the contents of the embedded file into the main .ai file as a group - whatever I try it persists. The problem also persists in exported formats, but here it is more consistent: the same block will always be missing. Oddly, if I move the embedded file to a different part of the workspace it will render/export fine, so it's as if a portion of the workspace has a 'black hole' that is unusable. (copying everything to a new document seems to copy the bug with it, so no luck there either). I could ignore it for a while, but I need the final exported versions of these files now and it's driving me mad. Any help/ideas would be much appreciated. Thanks, ben (Capture3 below is in an exported .png file. The vertical black line on the left which is cut off actually lies over the green/yellow/red dots on the left, which are not cut off, so the problem is not affecting all layers equally)