I don't know why this would be happening (I'm sure someone from HES will chime in) but wanted to mention that you can over-ride the default highlight settings by building Highlight and Lowlight templates of your own.
This is detailed in sections 18.3.1 and 18.3.2 of the manual.
I usually grab a fixture, bring it to full, make it White, and record a beam palette using the I and C masks. Then I rig click on that palette and select 'Set as Highlight Palette'.
I also like to set a Lowlight palette which is the same as above but with color in Congo.
Let me know if you have any questions about the custom Highlight palettes.
Updating older show files with the latest library is not really neccessary in most cases but for this particular bug the latest library with the latest Xspot profile resolves the issue.
Oddly, when I updated, it seems like everything merged cleanly except for some of my fixture pallettes for the xspot. Seems like only a few random ones (that were written as "by fixture" and it was only beam elements (like frost, zoom and iris) yet focus, gobo, and other traits seemed fine. Not a big deal, I just updated them, but figured it may have been a bug.