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I'm not sure if I'm doing something wrong, as I'm fairly new to Fuel. I've downloaded 0.9.3, played around with the view files, blocks, layout etc and got a couple of pages working fine. I then switched to the CMS, but when uploading blocks I started getting some 502 Bad Gateway errors, "The server returned an invalid or incomplete response." The site itself displayed fine, but eventually I couldn't even get the dashboard to display.
I assumed an error on my part, backed everything up and started afresh, new download, clean db install. I've just gone into the CMS, uploaded the first block, but when I tried a second it resumed the 502 Bad Gateway response. All I had done was modified the files needed to install Fuel. It's on a hosted server too, not my localhost server. Now if I try to save as block I get a 502 error on the url fuel/blocks/edit/2. Going back to the Control Panel works, and it appears that the block was saved too.