Since upgrading to v1.61 I've been getting a lot of the following:

It always corrects itself if I rebuild the solution, but if I leave a form and come back to it later it frequently re-appears.

-Larry

I was getting a lot of designer errors as well after installing 1.6.1. I don't know if it was just luck but in addition to cleaning each project in my solution and doing a full rebuild, I rebuilt all my partials, and re-set the SF Data Store connection and have had no further issues.

Keith Chisarik