Hi Jan, > Also, it ONLY works if the startdebug.lua file is open in ZBS and it MUST be > the file currently viewed. > It is as if the currently opened and VIEWED file influences the debugger > significantly, which is really weird. I get that the project dir has an > influence, but the currently VIEWED file? Probably a bug? No, as far as I understand your setup, it's not a bug, but it needs an explanation. ZBS will generally doesn't care if the file is the current one or not when searching for a file during debugging, as long as it's opened in the IDE (if you want the IDE to also open files for you, there is editor.autoactivate option). However, this only works when the file name is known. For example, if you run "lua.exe d:\foo\bar.lua", the interpreter reports "d:\foo\bar.lua" as the file path, so the IDE knows exactly what file to check for. However, in your case you load it as "../../startdebug.lua", which is likely the path that IDE gets, but when this path is combined with the project dir "..gamedir\scripts\", the combined path is "..gamedir\scripts\..\..\startdebug.lua", so the IDE checks for that file outside of "gamedir" folder and the file is (obviously) not there. Then the IDE falls back to the last resort, which is to check the name of the currently opened file and if it happens to be startdebug.lua, it will happily assume that this is the one you wanted to debug and remap the paths based on that information (which probably makes the breakpoints to work in the case as well). This is the same effect as can be achieved with the solution I sent you earlier, which also avoid the need to startdebug.lua. Hope the explanation sheds some light on what may be going on in your case. Paul.