I'm having the same issue.
I'm also using the subsites module and I have a pagetype that has a tab with images in a gridfield.
Sometimes I can create a new image record in the gridfield ok, but when I try to reload the record I get a 404 page not found error. Other times I get a little popup message saying "Not found" - In either case if I refresh I just get a blank page with the message "I can't handle sub-URLs of a Form object", but I have no idea what that means.
Can anyone suggest anything?
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