Xibo Client Download only 500 Kb of File And Stop Downloading

Hi. I use Xibo Server and Client Version 1.4.2
When i start Xibo Client it start downloading data from server. Client download only 2 files each 500 Kb and stop downloading.
If i close client and open again, it download additional 500 Kb of each file, if downloading file complete, client begin downloading next file. Again 500 Kb and stop.

In log file i found :

Info: <message>Only 1 layout showing, refreshing it</message><method>Schedule - NextLayout</method><logdate>27.02.2014 13:12:03</logdate><thread>UI Thread</thread>
Audit: <message>Next layout: </message><method>Schedule - Next Layout</method><logdate>27.02.2014 13:12:03</logdate><thread>UI Thread</thread>
Audit: <message>Schedule Changing to </message><method>MainForm - ScheduleChangeEvent</method><logdate>27.02.2014 13:12:03</logdate><thread>UI Thread</thread>
Audit: <message>Destroying Layout</message><method>MainForm - DestoryLayout</method><logdate>27.02.2014 13:12:03</logdate><thread>UI Thread</thread>
Audit: <message>Preparing new layout with path: </message><method>MainForm - Prepare Layout</method><logdate>27.02.2014 13:12:03</logdate><thread>UI Thread</thread>
Error: <message>Unable to change layout: Default layout</message><method>MainForm - ChangeToNextLayout</method><logdate>27.02.2014 13:12:03</logdate><thread>UI Thread</thread>
Audit: <message>Schedule Timer Ticked</message><method>ScheduleManager - Run</method><logdate>27.02.2014 13:12:04</logdate><thread>ScheduleManagerThread</thread>
Error: <message>Layout invalid: 5</message><method>ScheduleManager - LoadNewSchedule</method><logdate>27.02.2014 13:12:04</logdate><thread>ScheduleManagerThread</thread>
Error: <message>Layout invalid: 7</message><method>ScheduleManager - LoadNewSchedule</method><logdate>27.02.2014 13:12:04</logdate><thread>ScheduleManagerThread</thread>
Error: <message>Layout invalid: 8</message><method>ScheduleManager - LoadNewSchedule</method><logdate>27.02.2014 13:12:04</logdate><thread>ScheduleManagerThread</thread>
Error: <message>Layout invalid: 6</message><method>ScheduleManager - LoadNewSchedule</method><logdate>27.02.2014 13:12:04</logdate><thread>ScheduleManagerThread</thread>
Error: <message>Layout invalid: 4</message><method>ScheduleManager - LoadNewSchedule</method><logdate>27.02.2014 13:12:04</logdate><thread>ScheduleManagerThread</thread>

What does it mean?

I am using windows clien and server.
And this problem with downloading files only when i using internet connection to the server. When i using local network all fine. Internet connection i checked, all fine.