You can edit slashes out of your database in Admin => Edit Categories as your old program must be been improperly storing slashes. Our new program stores things correctly.
We do not normally show html but you need to set the allow html in products to show html and I set that for you.
I can not comment on links to official sites as I never have seen this in the product and there is nothing in the upgrade that would delete something. If you did some kind of template edit as we discussed before you would need to redo whatever edits you did. You could give more of an example also so I know what you mean here