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Is your logo in a table cell? If so, validate that table. NN4 can abandon whole sections of a table if there's any kind of malformed table code.
If the code is valid, then I'd try bringing the image back into an image editor, change one pixel and do a Save As. Then take the new image, change the pixel back and Save As the original filename.
And welcome to the forum, rocky27.
...it would be a good idea to try and correct your image problem if you can
Yes, especially if it's due to a coding problem of some kind. The NN4 problem might be a signal that some other browser you haven't tested in could also have a problem -- say a small screen browser for a mobile phone.
Nothing worse than looking bad to an early adopter who knows they have the latest technology. Could cost you a contract.