Why would the World Imagery layer sometimes not work, or only display a small section in workspace?

Hi all, I'm new to Global Mapper and I'm really enjoying the program, however I'm have a few issues with my display and I can't seem to nut out what it going wrong.  I've attached an example - sometimes the World Imagery layer is only partially visible.  Other times I'll start a new workspace and load the World Imagery layer and it isn't visible at all - as I zoom in and out it will flash on screen and disappear.  Can anyone suggest a way of correcting this?




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