i am using trenchbroom version 2020.2. trenchbroom is telling me that i have a hidden group and i am having a very hard time trying to find whatever group trenchbroom is saying is hidden. the only layer i have is the default layer. i have ungrouped just about every grouping that i had. i am thinking it is time to just call this quits and start anew with another map.

another issue is that i want to basically open two copies of trenchbroom or 2 maps at the same time where i can transfer objects from one map to another map. i have drump truck ds's videos. he stated in one of them that a person could pre create objects and then transfer them to a map they are working on by operating 2 trenchbrooms at the same time. i have not been able to do this as trenchbroom regulates to the map currently being worked on. i did place trenchbroom in 2 different directories and it did allow me to open two at a time but one of them crashed.

EARP 

I think the very first thing you should try is use the newer 2021.1 release instead. I don't know for sure if it will fix your issues, but it should be a better starting point for getting things figured out.