since v 0.7 (v 0.5/ 0.6 not tested ) it seems that X3 is not a friend of Nginx in cooperation with apache.
panel works fine, but frontend keeps showing pure html structure with loads of 404s. just plain text without images.
as soon as is swich-off Nginx, all is fine. Re-enabling Nginx keeps a working frontend until something gets changed in panel.
Also check-page keeps showing "Fail" on a working instance due to permissions even though all is set to "777".
For me it is not a problem as i can live without Nginx on this site.
Feel free to ask for server-access in case you're interested in this issue.