Synchronisation error

This error is showing up:

I have turned on logging. Here is an example of the exceptions it is throwing:

Program Version: 5.2a SR-6 (5.2.1.0155)
Time: 2014-06-18 09:40:43 +02:00 (2014-06-18T07:40:43Z)
Exception while syncing client: PreferencesSyncItem
Logos.Sync.Client.SyncClientException: Web service error: Status code not handled. Request: GET https://prefsapi.logos.com/v2/prefs/sync (status InternalServerError, content type 'application/json; charset=utf-8', content length 254) ---> Libronix.Utility.Net.WebServiceException: Status code not handled. Request: GET https://prefsapi.logos.com/v2/prefs/sync (status InternalServerError, content type 'application/json; charset=utf-8', content length 254)
   at Libronix.Utility.Json.Web.AutoWebServiceRequest`1.HandleResponseCore(WebServiceResponseHandlerInfo`1 info)
   at Libronix.Utility.Net.WebServiceRequestBase`1.DoGetResponse(HttpWebRequest webRequest, Func`2 getWebResponse, IWorkState workState)
   at Libronix.Utility.Net.WebServiceRequestBase`1.GetResponse(IWorkState workState)
   at Logos.Sync.WebService.JsonSyncService`1.Connect(IWorkState state)
   --- End of inner exception stack trace ---
   at Logos.Sync.WebService.JsonSyncService`1.Connect(IWorkState state)
   at Logos.Sync.Client.SyncClient.TryConnectToServer(IWorkState state)
   at Logos.Sync.Client.SyncClient.Sync(SyncPurpose purpose, IWorkState state)
   at Logos.Sync.Client.SyncV2Client.Sync(SyncPurpose purpose, IWorkState workState)
   at Logos.Sync.Client.SyncManager.SyncManagerThread()

This is happening for all parts of the sync (prefsapi, layoutsapi, readingprogressapi, etc.).

This forum page was down also earlier for a short time, so I just wanted to ask if there is a problem with the sync at the moment. Anyone else having this problem?