Firstly as a standard, when it comes to network rendering always work with file sequences not AVIs. PSDs should be fine...... When you import footage into combustion you should do it through the network neighborhood and not the local path root. This implements the UNC file paths for the files when you originally work with the footage... Saves time now instead of changing all the paths later.....
By setting a path for the input folders, combustion is looking only there for the footage. I suggests that you keep the input folders blank ...
Let us know if that works...
Splice...