If you were on 4.5.2, it was accidentally disabling explosions for everyone with a new faction. Install this to fix that issue, automatically.

IF YOU MANUALLY FIXED THIS FOR PLAYERS or otherwise don't want to break anything, then READ THIS:

When you stop the server to update, edit main.conf to change the config version (near the top of the file) to 10. This will preserve the explosion settings for all factions rather than reset them.

If you accidentally set to 10 and didn't want to keep the settings, just set it back to 9 while the server is stopped and it will auto-fix the explosion issue