I can appreciate that you feel the advice is "pathetic", particularly when it's not a quick fix.
But in the absence of concrete evidence that the problem is actually something wrong with v155 the best course of action is to rule it out. It's a process of elimination.
Your symptoms are not something I've ever witnessed in the many years I've been using Zen Cart. So, while I may not have an instant exact answer, I assure you my methods of diagnosis are sound. But, if you don't want to follow my suggestions, that's up to you.
With my last post I was going to suggest that another course of action would be to take the same database and code to a completely different server, ideally configured by a different hosting company, to rule out the server. But I figured you'd tell me that was a stupid idea. In hindsight I guess I was probably right.
I'd really like to see your site running normally again. But you have to help us help you.
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