Ok, members are posting without issues, so I believe the issues are fixed, fingers crossed. Sorry about the problems, its a caching thing... you never know what causes a problem until you do it and often learn from trial and error to some degree, especially with dynamic websites. Each software operate differently, so caching Xenforo software compared to Wordpress software, two very different things in how they output their content and what remains dynamic vs. static.
I disabled the initial changes I made, I think I identified the issue to correct it, and have enabled some of the caching aspects I had which I don't feel were the cause of the problem. Again, fingers crossed. Hopefully I awake tomorrow with no further issues.