elcou96

Can you post code?
 
Only thing I noticed is 
$VarToSet = $_POST['VarToSet']; session_registrer($VarToSet); Which is used wrong, session_register takes name of global variable, not variable itself, and it is deprecated since PHP 4.1
 
This should be enough, you can try to debug this and var_dump $_SESSION and $_POST after this line.
$_SESSION['VarToSet'] = $_POST['VarToSet'];  

There are few things.
You reload page just after calling ajax. Ajax is async, so it puts a call on js event queue, but reload is immediate, so the possibility is that you reload page before ajax request manages to fire, this is why it may work on localhost as there is not much delay, and it is not working on remote host.
 
to fix this reload your page inside complete callback of ajax method. It depends of what version of jQuery do you use.
 
Other thing is, why do you use ajax when you reload page anyway? You use ajax to get data without page reloading.

If it works for one browser but not the other, it's probably a JS rendering issue. Do you absolutely need to use Javascript? Would a "form" work posting to your SetVar.php not work for what you want? 
 
Another note, could you be calling the same file more than once in your code? Might have nothing to do with it, but give it a chance: Change your php "includes" into "require_once". Also any variables inside the php files being included should be predefined as "global" in order to be usable in the rest of your page.

You could edit your 'best answer' and share your solution for anyone else that has a similar problem

As you've both noted, this is a business.
 
One that relies on having an actively engaged audience that trusts me.
 
So consider this: Would I be a smart a businessman if I purposely deceived my audience for $100? Did that strategy ever make any sense in the history of the universe?
 
Let's assume the revenue of my company grows in a linear fashion with views (and therefore influence), which it basically does.
 
And we are kicking ass right now.
 
If I am as smart as I think I am, I would look at that graph and think to myself "hmm I could take $100 today to sell out, destroying that audience and making myself worthless to advertisers, or I could get $200 or $300 next year if my team and I can keep rocking on the way we are"
 
For very short term gain, I could definitely cash out of this thing, but even if I was a total scumbag who was just in it to make a buck and drive a lambo or whatever, I'd be an idiot to compromise the integrity of the channel for a few bucks today! I'm 29 and I've got a lot of years left in the gas tank.
 
It's very strange to me that you think I have more incentive to sell product today than I did when I worked at a retailer as as Salesman and then Product Manager. My literal job description was to sell product. The only reason I ever said anything negative about anything was the same reason I do it today. Because I want people to buy the right stuff. I'm the same person today that I was 8 years ago when I started making videos.
 
And a last note. We don't deny who our sponsors are or what the money is for. Why would you even bring up the Best Buy video? I was SO straightforward about the Best Buy sponsorship of the notebook back to school guide! I said in the first minute of the video that Best Buy had us make the video. And the rest of what I said (the fact that they let us pick any notebooks we wanted for the guide off their site) was also true.
 
So what's the issue here exactly? You don't agree with the laptops I chose? Then just say so. And I'll either politely disagree with you because I picked ones I liked, or I'll say "good point I didn't see that one. I'm only human"
 
edit: Just for lulz here's some more transparency about my job at NCIX: https://ca.linkedin.com/pub/linus-sebastian/52/a07/578
 
I'm not hiding this stuff.

A lot of assumptions being made here.
We don't take money to do reviews. We never have.
We take money to do advertisements, which are never labeled as reviews.
NVIDIA provided the graphics cards (and Cooler Master sent cases and coolers, ASUS sent motherboards, Intel sent CPUs, Kingston sent SSDs and RAM, Swiftech sent water cooling gear) for our editing workstations for product placement in the whole room water cooling series of videos we produced featuring this hardware extensively.
In the grand scheme of things, $6000 of graphics cards (don't imagine that's their BOM cost on them either) is a great deal for 1-2M impressions on a series of videos about using them.. but those videos were NOT a review. They were about a clearly sponsored (we said it was more than once) outrageous project.
As for sending "keeper" vs "loaner" units of hardware, yeah for many products we just don't do loaners anymore, but more than anything else this is to do with me not feeling like it's worth my time to play email tag for shipping labels and spend an hour driving to FedEX and filling out stupid international bill of landing and commercial invoice nonsense over like a $100 item that costs more to send back than to just not bother with anyway.
That and quite frankly even a negative review (for some reason) often generates a lot of sales for the manufacturer.. so as far as I'm concerned they can eat the cost of the item and I'll do whatever I want with it when we're done reviewing it - whether that's continuing to use it personally (Pebble Steel and iPhone 6 come to mind) - or re-visiting it only when we need to re-do our comparative numbers (here's a lesson on why this is necessary and we can't just re-use old numbers)
And on the subject of the Pebble and iPhone 6 - these are both items that were NOT provided by the manufacturer. One was purchased for my own use and the other was provided by a separate sponsor who makes skins for phones (dBrand), but I didn't necessarily mention this at the time because who cares? It doesn't colour my impressions of the device.
Here's an item I wasn't allowed to keep and won one of the two editor's choice awards I've ever given out: https://www.youtube.com/watch?v=s1uj6wQTu58
Here's an item was allowed to keep that I ripped apart saying it was worse across the board than the two similar products from other manufacturers that I compared it against: https://www.youtube.com/watch?v=-O1aCNrjV64
Here's an item I was allowed to keep that I basically ripped apart on camera and sent it back anyway because it had so little value to me I didn't even want to give it to a friend: https://www.youtube.com/watch?v=c3AgcltUM9s
And I could do this all day..
You may notice that most of the items we review we are fairly positive about. There is a reason for this, and it has nothing to do with being paid to review it.
I don't generally bother to review stuff that I already know is stupid junk.
The bottom line is this. You can either trust me or not trust me. Ultimately that's your deal. My job is to do what I do, and the people who recognize it for what it is - my opinion being given to you - will follow, and the others can go find someone who maybe they think "hasn't sold out" but might just "happen to agree with them" to listen to. Enjoy.