SharePoint 2010 : No available sandboxed code execution server could be found

This might cause your sand boxed cause to seize and not perform their regular functions.

You need to re-start(Stop and Start again) the Microsoft SharePoint Foundation Sand boxed Code Service from services on server. You might see that it is already started, still just Stop the service and Start again.

Central Administration > System Settings > Servers > Manage Services on server > Start the Microsoft SharePoint Foundation Sand boxed Code Service

Try this at first instance which might resolve your error. If this doesn’t work, you can email me and we can work it out together.