Hi – I also am having this problem on quite a few of websites on my Hostgator reseller hosting account. I have had the account for at least 15 years and this is a first. Only happens with JPG… not GIF or PNG or other types of files. If anyone gets a resolution without forcing GD, can you please follow-up on this forum?
Wow – I was so happy to read this post. I had the same problem and changing the styles worked great.
C1D – the post you are looking for to remove commas is:
http://wordpress.org/support/topic/minor-bug-in-ie8?replies=10