We are running CRM 2011 on-premises and we have a custom table that currently has a few hundred rows in it. This morning I went to manually add another row to the table from within CRM. When I clicked on <Save> the following error came up, which was reproducible:
"The plug-in execution failed because the Sandbox Client encountered an error during initialization."
As far as I can tell there are no plug-ins registered for this entity.
Any ideas? Any suggestions on how to research?
Thank you.