Readers who subscribe to my main RSS feed, for example from Thunderbird, report “invalid RSS feed”. Worse yet, the problem comes and goes.
I used http://feedvalidator.org/ to check my feed and SOMETIMES it reports two blank lines at the top. Whitespace isn’t allowed before the “<?xml version…” tag and some readers (like perhaps Tbird) barf.
Feedvalidator gives helpful info about themes and plugins being likely sources of spurious empty lines, but I can’t find the offenders.
The key point to this is that the problem is INTERMITTENT. Oft times it works, but I’ve seen it fail several times.
Any suggestions on how to locate the source of this problem? Anyone else seen it?
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