I followed hixen’s advice and it did work. Sort of.
Some of the pictures work and some don’t but i suspect that it’s related to the size of the original picture because larger images seem to crop properly but lower ones still break. That isn’t my issue though.
I’m concerned that having made the changes suggested i can no longer update a post without receiving an error.
Warning: Cannot modify header information – headers already sent by (output started at [redacted]…/plugins/wp-nivo-slider/wp-nivo-slider.php:631) in [redacted]…/wp-includes/pluggable.php on line 890
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EDIT
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NVM. I seem to have fixed my problem. my wp-nivo-slider.php had two empty lines at the end. I had more or less disregarded them as as being an issue cause, you know, they’re blank. But low and behold, that was what did it. removed those two and it works. Weird.