dumpcap.exe opens already pointing towards a nonexistent file

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I am attempting to find an apparent IP address conflict that occurs at stochastic intervals. Since I can't predict when this apparent conflict will occur, I was attempting to use the dumpcap.exe to save the captures in managable file sizes. Went on youtube, watched some videos, all good. Did a dry run in my office and everything appeared to be working as expected. Loaded wireshark onto another laptop, took it to the managed switch and plugged it into a mirrored port of the device that was giving the IP Conflict fault. Ran wireshark to make sure that it was gathering the proper data.

It was all good right up till here.

When I attempted to run dumpcap.exe, I got a screen saying something similar to

Capturing on 'Local Area Connection* 10' File: C:\Users**\AppData\Local\Temp\wireshark_Local Area Connection- 10R7P3Z2.pcapng

There is a flashing cursor on the line after but no keyboard input is accepted.

I tried the same with another laptop: Same results. When I went back to my office, I got the same results, ie, a screen showing a similar message to the one above.

So, has anyone else had a similar problem? Am I being obtuse and just doing/not-doing something?

Any help or insights would be appreciated.