Dave, @slbaumgartner Steve and @pcmoor Phillip:
Thanks for the status on @jim_foltz. I posted to possibly get his attention as Trim and Keep is one of my most used and reliable extensions, especially for woodworking. The UnTagging issue seems to be quite recent and will be a nuisance. At least the Trimming works flawlessy even when some of the other extensions dont.
As Dave mentioned, I have BoolTools2 and Eneroth Solid Tools and both have issues which dont appear with Trim and Keep.
My issues with Bool Tools2 appear in the link below. At the time, I also opened a technical support ticket with MindSight Studios. I’m hoping @Whaat and his team will provide a resolution.
https://forums.sketchup.com/t/crashing-using-booltools/170739
Maybe Trim in the native Solid Tools will be improved soon as a fix. 
Zaz1