It's not doing that here. Is there a message in the Debug file?
Never usually have issues with trainers in the several years with CH, but need to post that i did have a similar problem with some trainers recently, in which i got the elevated admin rights prompt, and the splash image as usual, but no trainer launched/appeared.
only had this issue on a small number of recent trainers (XCOM 2 & AC Origins +Odyssey), and since 1903 update was applied. All my other 300+ trainers seem fine, launch in admin mode and appear on screen.
AV & Malwarebytes apps have already been set to no scan/ignore the CH folders and Trainer storage folder i use -- for several years, so not the usual beginner issues.
Eventually remembered i recently tested Heimdal Thor new package, as part of my IT work, and forgot the AV element service was running in the background - with no exclusions set, and had been slowly quarantining all the CH TMP trainer files at every launch!! -- so those with issues launching trainers, double check ALL your security apps, they all need to stay clear of the CH working folders
Chris, Mike and team, keep up the good work. ⭐
it's probably something else preventing the option to work in some spots. Atlantis must be a specific unique thing regarding the placement of characters into a location.