From working with a support rep, we eventually resolved this somewhat magically. I tried deleting the form via the Tools menu on the left sidebar, but it still persisted despite showing a successful confirmation. We eventually tried to delete the form for one of my 2 properties, which actually didn't seem to delete that property's form, but somehow did delete the aggregation form that was preventing the efile. This didn't seem to change anything else in my return, most importantly, the total refund amounts.
Hope this helps others, despite being inexplicable.
