Problem to open a powerpoint file with Office Web Apps in Sharepoint 2013

Hello,

In my company we have installed last week a server (Windows Server 2012) with sharepoint 2013 and a server (Windows server 2012) with Office Web Apps server 2013.

We can open and edit every kind of file (word, excel, onenote) but its not working with powerpoint. When we click to open a file, the web app seems to load, we can see the buttons (grey and deactivated) of the ribbon, but it keeps loading 3-4 minutes before that a message appears saying that a problem occurred, that we need to check the network...

I have found that in the OWA server logs:

02/21/2014 10:04:43.64      pptviewerfrontendwatchdog.exe (0x3C48)    0x28A0
 Services Infrastructure           Services Infrastructure Health     ajczk
  Unexpected  Event id 8120 from source 'Office Web Apps' does not map to an
  OfficeServiceType value, invalid health report detected, body follows: The
  AgentManager is running.

I have found that in the Sharepoint server logs:

SharePoint Foundation - DistributedCache - ah24w - Unexpected  Unexpected Exception in SPDistributedCachePointerWrapper::InitializeDataCacheFactory for usage 'DistributedLogonTokenCache' - Exception 'Microsoft.ApplicationServer.Caching.DataCacheException: ErrorCode<ERRCA0009>:SubStatus<ES0001>:Le cache auquel il est fait référence n'existe pas. Contactez l'administrateur ou utilisez l'outil d'administration du cache pour créer un cache. à Microsoft.
ApplicationServer.Caching.DataCache.ThrowException(ResponseBody respBody,RequestBody reqBody) à Microsoft.ApplicationServer.Caching.DataCacheFactory.GetCacheProperties(RequestBody request, IClientChannel channel) à Microsoft.ApplicationServer.Caching.DataCacheFactory.GetCache(String cacheName) à Microsoft.SharePoint.DistributedCaching.SPDistributedCachePointerWrapper.InitializeDataCacheFact...

When I look with Firebug the HTTP requests when I try to open a presentation, I see a lot of request "ppt/view.svc/jsonAnonymous/GetPresentation." . The response body of this HTTP request return an error code "45"

If somebody could help me Im the happiest in this world because I try everything since last week :-(

Thanks a lot in advance!