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In some cases you could use the “after” Event Receiver rather than the “before” Event Receiver, but isn’t really a sound solution.The best option would be to rewrite the Web Part to run its code on the client, either through Client OM (ECMAScript or Silverlight), or the Share Point Web Services.After this we noticed errors like “User cannot be found”.
Your code is restricted to a subset of the Share Point API but allows you do most regular operations inside a Site Collection.
Also not sure why the Event Receivers were missing in the first place.
It could be because some “questionable” actions happened during the setup of the site, but it could as well be a bug in Share Point 2010 RTM or later.
Here’s a scenario that fails every time and everywhere: [SPUser Code Solution Execution Failed Exception: Unhandled exception was thrown by the sandboxed code wrapper's Execute method in the partial trust app domain: The sandboxed code execution request was refused because the Sandboxed Code Host Service was too busy to handle the request.] So what’s going on here ?
In light of this you might conclude that there’s no possible communication between two sandbox code requests (the Web Part and the Event Receiver).
I tried reproducing that configuration in a new document library but there everything kept working, so the issue had to be with the existing library.