keeps rendering the old image, not the changes I've made. A similar questions was answered at
but I can't find where the problem lies.
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old question, I guess you figured out meanwhile, but here is the answer
You have a shapekey Shin that you must set to 0 :
in edit mode it will show you only the active key that you are editing, as soon as you leave Editmode, the final model taking in account the overall shapekeys mix will be displayed (and rendered in your case)