The content center macro is paid now and that most likely the cause for your problem. I got to the same point recently and had to drop a lot of formatting because of it. The ability to center content well in a page is definitely not worth the price they are asking.
Thanks for your reply - I do have the Center Content macro and it works just fine. The problem is that we upgraded from Confluence 3.5.7 to 6.0.3, and there are macros such as center - entered in wiki markup in 3.5.7 - that 6.0.3 doesn't recognize. Same thing with all of my anchors entered in 3.5.7 - 6.0.3 doesn't call them unknown, but they don't work either.
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