For me the 'modified' indicator is not only red, it's a diamond shape. The 'saved' indicator is a green circle (a never modified file has no indicator at all). So even without color these states can be distinguished.
If the diamond vs. circle isn't distinctive enough of a difference, perhaps IDM can be emailed to suggest that they make the shapes even easier to tell apart.
I see that the help file shows that the 'modified' indicator is supposed to be a yellow circle, so maybe different versions of UE use different images? I'm looking at UEStudio 184.108.40.206 at the moment (which uses a diamond shape for modified files).