We have a site set up and running for the past several weeks. It has generally not had any issues, but we have had several people comment lately that they cannot submit a form when in Safari. They say the form just hangs after hitting Submit, and nothing happens. Other Safari users have told us they submitted forms without any problems, though.
It may be happening more with Safari on iPhone than desktop, but we are still looking into that.
Is this a known issue? Any suggestions from anyone?