UBB.threads PHP Forum Software Community Forums UBB.threads 6 Version 6 Support How do I avoid blank body and subject?

At the very least, as has been stated, you'd want to upgrade to 6.5.5 so the security issues are fixed. As for the problem with hitting the back button. It's an issue with the way the forms are handled/created and the headers that are sent. No easy way to fix this in the 6.x versions without creating other problems.