Another way which solved this problem for me on 2 different hosting provider (CrazyDOmain.com.au & another one, cant remember it ) .
Add a php.ini with the new memory limit in the framework/ folder ! yes , after hours of test this worked .
BTW, I only have problems on hosting provided by clients, my VPS with HostGator works perfect .
Edit: @figja , I just read your post . I can imagine how much trail & error it took to solve it 
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