Developers reported an issue in a New SharePoint 2010 Environment: When they try to activate sandboxed solutions "Activate" button is disabled (greyed out)! This is because: By default, sandboxed solutions are disabled in SharePoint.
Enable Sandboxed solution by starting "Microsoft SharePoint Foundation Sandboxed Code Service"!
Go to Central Administration >> System Settings >> Manage Services on Server, start "Microsoft SharePoint Foundation Sandboxed Code Service".
Microsoft SharePoint Foundation Sandboxed Code Service can be stared with PowerShell:
Start-Service -Name SPUserCodeV4
Now, you will be able to upload & activate sandbox solutions!
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