I'm not sure what would be causing the issue when launching with explv manager, if you are able to run the script via cli without using explv manager then my guess is that the manager is the root of the issue.
The problem with saving loot on debian looks to be because access to the settings file is not being allowed, looks the same as the issue reported HERE which unfortunately does not look to be resolved. You mentioned cli parameters in relation to this but from the sounds of it this is occurring not when you launch from CLI but rather when you launch the script normally, is that the case? I have updated the script just now so that when launched from CLI there should be nothing in the script running that will access the settings file, the live version will be 7.3. Hopefully that fixes this problem.
It's on my to do list, though has been for some time, unfortunately I'm not currently doing updates to scripts other than bug fixes and maintaining their functionality as they are due to my busy schedule.