Hi,

I have a 7.2.5 umbraco install running on IIS 8.0 and whenever the application pool is recycled all pages show a blank page without any code.

Here are the UmbracoTraceLog.txt just after the recycling event (it is configured at 15:30:00):

2015-05-22 15:30:01,166 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Determining hash of code files on disk 2015-05-22 15:30:01,186 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Hash determined (took 14ms) 2015-05-22 15:30:01,195 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Starting resolution types of umbraco.interfaces.IApplicationStartupHandler 2015-05-22 15:30:01,214 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Completed resolution of types of umbraco.interfaces.IApplicationStartupHandler, found 37 (took 18ms) 2015-05-22 15:30:01,346 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Starting resolution types of Umbraco.Core.PropertyEditors.IPropertyEditorValueConverter 2015-05-22 15:30:01,347 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Completed resolution of types of Umbraco.Core.PropertyEditors.IPropertyEditorValueConverter, found 0 (took 1ms) 2015-05-22 15:30:01,348 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Starting resolution types of Umbraco.Core.PropertyEditors.IPropertyValueConverter 2015-05-22 15:30:01,349 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Completed resolution of types of Umbraco.Core.PropertyEditors.IPropertyValueConverter, found 16 (took 1ms) 2015-05-22 15:30:01,374 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Starting resolution types of Umbraco.Web.Mvc.SurfaceController 2015-05-22 15:30:01,376 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Completed resolution of types of Umbraco.Web.Mvc.SurfaceController, found 8 (took 1ms) 2015-05-22 15:30:01,376 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Starting resolution types of Umbraco.Web.WebApi.UmbracoApiController 2015-05-22 15:30:01,380 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Completed resolution of types of Umbraco.Web.WebApi.UmbracoApiController, found 35 (took 3ms) 2015-05-22 15:30:01,427 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Starting resolution types of Umbraco.Core.Media.IThumbnailProvider 2015-05-22 15:30:01,428 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Completed resolution of types of Umbraco.Core.Media.IThumbnailProvider, found 3 (took 0ms) 2015-05-22 15:30:01,428 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Starting resolution types of Umbraco.Core.Media.IImageUrlProvider 2015-05-22 15:30:01,429 [10] INFO Umbraco.Core.PluginManager - [Thread 1] Completed resolution of types of Umbraco.Core.Media.IImageUrlProvider, found 1 (took 0ms) 2015-05-22 15:30:02,451 [10] INFO Umbraco.Web.Search.ExamineEvents - [Thread 1] Initializing Examine and binding to business logic events 2015-05-22 15:30:02,585 [10] INFO Umbraco.Web.Search.ExamineEvents - [Thread 1] Adding examine event handlers for index providers: 3 2015-05-22 15:30:12,107 [10] INFO Umbraco.Web.UmbracoModule - [Thread 13] Setting OriginalRequestUrl: localhost:80/umbraco 2015-05-22 15:30:12,392 [10] INFO umbraco.content - [Thread 13] Load Xml from file... 2015-05-22 15:32:16,553 [6] INFO Umbraco.Web.Scheduling.BackgroundTaskRunner1[[Umbraco.Web.Scheduling.IBackgroundTask, umbraco, Version=1.0.5610.18898, Culture=neutral, PublicKeyToken=null]] - [Thread 87] Down, tasks completed. 2015-05-22 15:32:16,577 [6] INFO Umbraco.Web.Scheduling.BackgroundTaskRunner1[[Umbraco.Web.Scheduling.IBackgroundTask, umbraco, Version=1.0.5610.18898, Culture=neutral, PublicKeyToken=null]] - [Thread 87] Down, tasks completed. 2015-05-22 15:32:16,577 [6] INFO Umbraco.Web.Scheduling.BackgroundTaskRunner1[[Umbraco.Web.Scheduling.IBackgroundTask, umbraco, Version=1.0.5610.18898, Culture=neutral, PublicKeyToken=null]] - [Thread 87] Down, tasks completed. 2015-05-22 15:32:16,588 [6] INFO Umbraco.Web.Scheduling.BackgroundTaskRunner1[[Umbraco.Web.PublishedCache.XmlPublishedCache.XmlCacheFilePersister, umbraco, Version=1.0.5610.18898, Culture=neutral, PublicKeyToken=null]] - [Thread 80] Down, tasks completed. 2015-05-22 15:32:16,712 [6] INFO Umbraco.Core.UmbracoApplicationBase - [Thread 78] Application shutdown. Reason: HostingEnvironment 2015-05-22 15:35:18,270 [10] INFO Umbraco.Web.Scheduling.BackgroundTaskRunner1[[Umbraco.Web.Scheduling.IBackgroundTask, umbraco, Version=1.0.5610.18898, Culture=neutral, PublicKeyToken=null]] - [Thread 16] Down, tasks completed. 2015-05-22 15:35:18,372 [10] INFO Umbraco.Web.Scheduling.BackgroundTaskRunner1[[Umbraco.Web.Scheduling.IBackgroundTask, umbraco, Version=1.0.5610.18898, Culture=neutral, PublicKeyToken=null]] - [Thread 16] Down, tasks completed. 2015-05-22 15:35:18,372 [10] INFO Umbraco.Web.Scheduling.BackgroundTaskRunner`1[[Umbraco.Web.Scheduling.IBackgroundTask, umbraco, Version=1.0.5610.18898, Culture=neutral, PublicKeyToken=null]] - [Thread 16] Down, tasks completed. 2015-05-22 15:35:18,384 [10] INFO umbraco.content - [Thread 14] Save Xml to file... 2015-05-22 15:35:18,396 [10] ERROR umbraco.content - [Thread 14] Failed to save Xml to file. System.NullReferenceException: Referencia a objeto no establecida como instancia de un objeto. en umbraco.content.SaveXmlToString(XmlDocument xml) en umbraco.content.

Thanks for your help.

Regards,

Richard