Links displaying as plain text, and html tags not applying, no matter which text format is selected
It's hard to suggest a solution without examples, but I'd suggest you check the order of your text format filters (/admin/config/content/formats/full_html) and see if:


Convert URLs into links is still turned on
There are no additional filters acting on links or &lt;a&gt; tags that would cause them to be killed or hidden
Make sure your links look like links! Obscure ones like bit.ly/4321 or even google.com won't get picked up. If they aren't getting picked up, adding http:// to the front of it normally triggers the auto URL filter.


If that doesn't work, see if you can post some example code. If we can see how they are being hidden, we might be able to assist better.