Hi Force,
I figured it out. Now i know what the issue is, but not sure why it would cause all this. My thanks still stand for you because if it wasn't you i was never gonna figure this out.
So today i did the same thing which i did last time except last time i made so many changes that i lost track, but today that was the latest change i made and it got messed up.
Here is why it's happening.
my old site name (as an example) was abc.com and now i changed it to xyz.com so i thought i should change abc.com to xyz.com on my forum by going to
Style & Templates > Replacement Variable Manager and in each style i did search text and replace text with so search for abc & replace with xyz.
Now that would change all abc.com to xyz.com, but it start giving me errors about security token invalid.
At this point if you think or u know why it can happen then i will love to get that fix or else i will just leave it the way it is.
Once again thanks for ur help because if u would've not suggest me the first solution i would've never thought about all this and keeping track of changes.