Tshark crashes if I run it after changing the default interface (in Wireshark)

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How did you change Ethernet to be default and what happens when shark exits?

$ tshark -D
1. \Device\NPF_{xxxx-xxxx-xxx-xxx} (Local Area Connection* 10)
2. \Device\NPF_{xxxx-xxxx-xxx-xxx} (Local Area Connection* 9)
3. \Device\NPF_{xxxx-xxxx-xxx-xxx} (Local Area Connection* 8)
4. \Device\NPF_{xxxx-xxxx-xxx-xxx} (Ethernet)
5. \Device\NPF_Loopback (Adapter for loopback traffic capture)
6. \Device\NPF_{xxxx-xxxx-xxx-xxx} (Local Area Connection)
7. ciscodump (Cisco remote capture)
8. randpkt (Random packet generator)
9. sshdump (SSH remote capture)
10. udpdump (UDP Listener remote capture)

$ tshark
Capturing on 'Local Area Connection* 10'
0 packets captured

$ tshark -i 4
Capturing on 'Ethernet'

From Wireshark>Edit>Preferences>Capture>Default Interface and i put it to Ethernet. When i run tshark.exe then for a split second everything is normal and it manages to capture 1-2 packets before it immediately closes. That's all

So it doesn't close immediately, as it manages to capture a few packets.

You say you "open" tshark.exe; do you mean you run it from the command line, as per @bubbasnmp's eample, or do you mean you double-click it in Windows Explorer?