I've installed QGIS Server and QGIS Web Client on an Ubuntu 12.04 Server according to these instructions: https://github.com/qgis/qgis-web-client
When I load my own project with the Web Client, it shows the correct table of contents but no map, just the box that says "loading map". A WMS service of my project is running fine and the two sample projects (helloworld, naturalearth) are displayed by the Web Client as well. Looks like the client doesn't find the data for the project.
On the server my folder structure looks like this:
The project was created with QGIS 1.8 for Windows using relative paths and this folder structure:
Where do I have to put the "shapefiles" folder? Do I need to specify that location somewhere?