There was an update on Wednesday, and immediately afterwards I've had problems with datasets. It seems that the "edit dataset" tool now mandates filling in fields that don't exist. For example, Refseq gene lists that don't have a field for "visualization." Unless I fill in all fields, whenever I save I get this error: "Error occured while saving. Please fill all the required fields and try again."
Furthermore, simple operations like intersects, which works right before the update, didn't work immediately after.