how can I determine where vimrc comments setting being is overwritten on file load

I have in my *vimrc files
set comments=s0:/*,mb:*,ex:*/,://,b:#,:%,:XCOMM,n:>,fb:-
which does what I need with regard to company formatting rules.

On loading a .c file, the comments setting is getting set to
comments=sO:* -,mO:* ,exO:*/,s1:/*,mb:*,ex:*/,://
which doesn't follow our rules.

Is there an easy way to trace/find out exactly which
plugin/script is overwriting/re-setting my format?

Thanks,
reid

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