I’m having this same issue as well. The error started to occur once I had hit a certain point in the number of elements I had in the post. Smaller posts continued to work fine, a longer post with five or six flexible content rows breaks.
I’m using WordPress 3.9 and have Flexible Layout as well as Repeater fields. I also have a couple of relationship fields, which I know are also resource intensive.
I guess what I would add to this question is – is this issue a resource limitation issue, or is there a loop happening because of the combination of addon plugins and fields that needs to be optimized?
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