ngx_pagespeed_messages broken

[jeffkaufman]

With 1.7.30.1 even with pagespeed MessageBufferSize 200000; the messages buffer doesn't load.

Reported on the mailing list as:

Previously we were running 1.6.29.7-3453 and ngx_pagespeed_message worked, however since upgrading to 1.7.30.1-3609 it is now returning 'Writing to ngx_pagespeed_message failed. Please check if it's enabled in pagespeed.conf."

We haven't changed our conf file, these are the relevant lines

pagespeed MessageBufferSize 200000;
location ~ "\.pagespeed\.([a-z]\.)?[a-z]{2}\.[^.]{10}\.[^.]+" { add_header "" ""; }
location ~ "^/ngx_pagespeed_static/" { }
location ~ "^/ngx_pagespeed_beacon$" { }
location /ngx_pagespeed_statistics {  }
location /ngx_pagespeed_message {  }
location /ngx_pagespeed_global_statistics {  }
location /pagespeed_console { }

I tested this on jefftk.com, and it doesn't work there either.