I upgraded confluence from latest 3.x (3.5.17) to latest 4.x and all the wiki pages are broken:
1) Storage format got to be change to xhtml.
2) you need to upgrade your macros to xhtml.
3) What kind of implementation you have done for pages based on it it will give you xml or ac tags related errors.
xhtml combines xml with cDATA and html.
you need to update your plugins and then upgrade data.
it seems to be you need to update the code for macro 4.2.u can post the details for customized macro or u can share specific macro class implementation i with storage format for page it will help to identify rendering system.
if u need more assitance u can send email to me firstname.lastname@example.org.
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