When attempting to create a new workflow using SharePoint Designer 2010, I've encountered the error:
"The list of workflow actions on the server references an assembly that does not exist. Some actions will no be available. The assembly strong name is Microsoft.SharePoint, Version=22.214.171.124, Culture=neutral, PublicKeyToken=71e9bce111e9429c. Contact your administrator for more information."
In investigating this, I did find a post answered by Paul Stork on the Microsoft site - in his reply to the problem, he inidcated that this would typically happen when someone had added a custom workflow DLL to the WSS.ACTIONS or MOSS.ACTIONS files located in the hive under Template\1033\Workflow.
That said, as you can see by the error above, "Microsoft.SharePoint" is hardly a custom DLL. I got the above to occur when trying to create a workflow in a team site type site collection in a full instance of SharePoint (Standard or Enterprise).
I found two ways that seem to fix this:
1) Close Designer and run an IISReset - reopen Designer and try again
2) Use Designer to open an existing SharePoint publishing site (or create one if necessary) and create a new workflow (you should not get the error). Don't save it, just simply close Designer. Reopen the original site and try again.
SharePoint Experts, Information Architects, Expert Witness
SICG provides a broad array of business and technology consulting from architecture to design to deployment of global systems with a focus on surfacing data in the enterprise. We focus on the "How", not just the possible. Contact me direct: firstname.lastname@example.org or call 704-873-8846 x704.