As you all probably know, versions since 1.8.4b can't display subs in any color, other than white, without a greenish cast/tint.
You can, however, use v 1.8.4b (available here:
Click) and substitute the executable from v 1.10.6 (tsmuxer.exe). This way all the updates in 1.10.6 are working with the older simplified gui.