Per bug 12056, *some* systems appear to have bad interactions with the new preprocessor, leaving strip markers in place of <nowiki>, <ref>, etc on page edit.

Neither Tim nor I could reproduce it on our test systems... I tried switching the new code in briefly on the live system, but alas found that at least some portion of our production servers are showing it.

Will do some further investigation on this; might be interaction with another extension, or order of operations, or a weird config issue... Bleah!

Another note -- I found that *something* on the live site is triggering very deeply nested function calls in the proprocessor expansion, which triggers the 100-stack-frame-deep recursion bailout in Xdebug which is running on one box for diagnostic purposes.

Stack trace: http://wikitech.leuksman.com/view/Preprocessor_stack_trace

-- brion vibber (brion @ wikimedia.org)