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We are facing an issue with Sandbox Solution which handles the “ItemAdded” event receiver. It works like a charm however does not work when the below events are reported in the ULS.

04/03/2013 07:57:16.94  SPUCWorkerProcessProxy.exe (0x20BC)              0x07AC SharePoint Foundation Upgrade              fbv7                Medium               [SPUCWorkerProcessProxy] [SPDelegateManager] [DEBUG] [4/3/2013 7:57:16 AM]: Waiting for mutex to initialize type dictionary             
04/03/2013 07:57:16.94  SPUCWorkerProcessProxy.exe (0x20BC)              0x07AC SharePoint Foundation Upgrade              fbv7                Medium               [SPUCWorkerProcessProxy] [SPDelegateManager] [DEBUG] [4/3/2013 7:57:16 AM]: Obtained mutex   
04/03/2013 07:57:16.94  SPUCWorkerProcessProxy.exe (0x20BC)              0x07AC SharePoint Foundation Upgrade              fbv7                Medium               [SPUCWorkerProcessProxy] [SPDelegateManager] [DEBUG] [4/3/2013 7:57:16 AM]: Registering assemlies and sequences             
..............
..............
..............
04/03/2013 07:57:16.95  SPUCWorkerProcessProxy.exe (0x20BC)              0x07AC SharePoint Foundation Upgrade              fbv7                Medium               [SPUCWorkerProcessProxy] [SPDelegateManager] [DEBUG] [4/3/2013 7:57:16 AM]: Registering [Microsoft.SharePoint.Upgrade.SPWebServiceSequence] for [Microsoft.SharePoint.Administration.SPWebService], Phase: 2147483647, Order: 0.    
04/03/2013 07:57:16.95  SPUCWorkerProcessProxy.exe (0x20BC)              0x07AC SharePoint Foundation Upgrade              fbv7                Medium               [SPUCWorkerProcessProxy] [SPDelegateManager]  

What is happening here and how to fix this?

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