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My Fire 5th generation running 5.1.1 connects without problem to calibre 2.52 on Win7 Pro.
My guess is that the firewall or antivirus on your desktop computer no longer allows calibre to accept connections from CC. Calibre updates sometimes are flagged as new programs, especially if you are running a third-party AV.
Another possibility: after the update the Fire is connecting to a wireless network that doesn't allow connections to a cabled machine (the main desktop) but does allow connections to other wireless devices (the portable). Be sure that the Fire is connecting using a trusted SSID + password.
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