Finding files and downloading them are 2 seperate things.
When a file is found it indicates that a file is hosted on another machine. However, that machine may be busy providing other clients and may have no slots available for your request.
Always take a look at the score.
The higher the number, the more clients the requested file have, making the change of a fast download (start) higher.
XoloX uses download of multiple hosts, so a higher score can also mean a significant faster download speed.
When however you download stays at 0%, have patience, it may start whenever a host comes available, XoloX will keep checking the hosts for availability.