Hi Ralph,
We haven't had complaints that I know of regarding the red for the handles. They are thin lines, which we do to try to minimize their covering other aspects of the score. I'm including a screenshot here of a highlighted slur on my machine:
!!!RedHandles.png
How does this look for you? For me on my machine it's quite clear, so I'm wondering if maybe a color setting for Windows for your machine or monitor may need to be tweaked (I have run into this issue with other users for aspects such as the highlighting when a Region is selected).
I'm not sure what version of Windows you're running, and those settings can vary depending on that. It might be helpful to do an internet search for "color" or "contrast" settings for your version of Windows. For your monitor you may want to try working with the color and/or contrast settings. I know for my current monitor it took me a little while to get the settings to my liking
Just some thoughts.
ttfn,
Sherry