Hi acer152,
MasterPage will not impact this issue, you just need the confirm the code below implementation each time the page load
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editor1.Setting("security:ImageGalleryPath") = "~/yourFolder"
editor1.Setting("security:ImageBrowserPath") = "~/yourFolder"
editor1.Setting("security:MediaGalleryPath") = "~/yourFolder"
editor1.Setting("security:ImageGalleryPath") = "~/yourFolder"
editor1.Setting("security:FlashGalleryPath") = "~/yourFolder"
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Regards,
Ken