Sounds like the renderer is crashing without finishing - which is not unusual at 25 megapixels.

Are you using x64 version? How much RAM do you have?

And please do not be offended, but what makes you think your render has to be 25 megapixels? $3000 professional cameras don't even produce that much resolution. Are you printing a 12 foot mural that will be observed from 5 feet or less?

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)