HI,
I am currently using 5.20 (going to update to the latest shortly)
Why aren't you using the rapid debugger?
I have used this but it's very slow when running my project for some reason. (I also found the same issue as above happens with the rapid as well, and happens more often)
When I use it on a basic project it's fast but when I start using SQL, networking, ULV etc it runs slow and I find it runs more reliable in the Legacy for some reason.
Maybe the latest B4A fixes some issues and will try again with that version.