I purchased a Google Tag Manager extension . I activated it, and it supposed to inject some html code just after the body tag in my Magento 1.7 version, but it's not . I installed it locally (Magento 1.9) and it's working fine .
I also tried other extensions, they work flawlessly locally but not on the 1.7 remote version .
My question is, is there some permissions to set to let the extensions inject html code ? Am I missing something ?
template
andlayout
files to that themeEnable/Disable
, etc..) clear/flush cache. Also check if you have ANY advanced cache installed your site.