Star Explorers has been updated to version 4.6.5B.
This addresses a couple issues.
1. Sonic Cannon - this weapon should be working again. Somewhere along the way it stopped working, and I am not 100% sure why. I was able to track down the cause though, I think it was actually way back when I updated the game's engine from A7 to A8. Sorry it took so long to fix ... I do remember someone mentioning it a while ago, but sometimes these things slip my mind!
2. Invisible Barriers - One of the recent changes that should help the character getting stuck in caves actually introduced a new problem. It was causing the character to get stuck on outdoor terrain! So I have been able to identify that one part of the last update was not actually essential to the issue, and was responsible for causing this secondary issue.
The good news is that the character should no longer get caught up in any invisible barriers.
Happy exploring!