Imported bank payments not working

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I have one client for whom only payments imported are not posting. I imported bank statements from AutoEntry. The deposits can be classified and Created or Matched, but payments out don't work. I can bring up the vendor, account and choose the payment method, but when I hit Create, nothing happens. I had a chat going yesterday but never heard back from the technical department. Has anyone got a fix? I have a lot to do this weekend - Monday isn't acceptable!