I had a launcher for firefox with command
TZ=UTC firefox. Suddenly it stopped working, I think after I did
pacman -Syu (I only clicked again much later so it could be something else). I am using arch linux and mate.
I also tested trying to open other applications with
TZ=UTC prefixed and it didn't work, so doesn't seem like a firefox issue.
When I click the launcher nothing happens. If I type the command of the launcher in the terminal it works. How can I further investigate what's happening / fix this?