Packet Capture Shows No TCP, UDP, or HTTP Traffic

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It appears that IPv4 recognition and dissection might be disabled in your configuration, which would also prevent the dissection of TCP or UDP on top of IPv4, and thus would prevent the discussion of HTTP on top of TCP on top of IPv4.

Select "Enabled Protocols..." from the "Analyze" menu. Type "ipv4" in the Search box. It should show a row that has "IPv4" and "Internet Protocol Version 4" in it. If there is not a blue checkbox to the left of "IPv4", check that checkbox and click "OK"; the lack of a blue checkbox would mean that IPv4 is, in fact, disabled in your Wireshark configuration, and checking the checkbox and clicking "OK" should enable it and cause the IPv4 packets to be dissected.