Hi,
> I have been told (from another WAMP user) that it could be the headers that new WAMP uses
Wampserver itself does not send any header whatsoever.
As I wrote earlier, you have different configurations:
Not the same Apache versions
Not the same PHP versions
Not the same MySQL versions
So, necessarily, PHP extensions that do not have the same versions and PHP parameters that are also not the same.
Have you checked the Apache, PHP and MySQL log files for errors or warnings.
As long as you have different environments, no reliable comparison is possible.
Start already by comparing the results of phpinfo() between the two environments. You can also compare HTML sources in both cases.
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons