I have been using the Mac for a few days including using it to blog this site. When I snip an image using the Mac Grap tool, the image is created in Tiff format.
You might know that this format is an Apple format and if I load the image into WordPress media, it would not be displayed.
I would then have to ‘export’ it into PNG format for it to be probably displayed in WordPress. If you think life could be tough if you switch from using a PC to a Mac, this could be one thing that caused it.