Yet Another Moving WordPress Post

Hi all,

A friend of mine has a WP install at https://example.com/vlog. She has the settings under the General tab as:

WordPress address (URL) https://example.com/vlog
Blog address (URL) https://example.com

This has worked fine for a few years.

She has installed a “dev version” in another subdirectory at https://example.com/dev. She is now ready to make this dev install live and has asked for my help.

In all my WP experience, oddly, I’ve never had to do this, but it seems quite easy after reading the codex directions. However, I can’t get it to work and wondered if someone here can clue my into the “missing link”.

So, I logged in:
https://example.com/vlog and changed the settings to:
WordPress address (URL) https://example.com/vlog
Blog address (URL) https://example.com/vlog

Then I logged in at https://example.com/dev and changed the settings to:
WordPress address (URL) https://example.com/dev
Blog address (URL) https://example.com/

However, when I visit the url https://example.com, I am seeing the install that resides in the /vlog/ subdirectory still. I know this because the /vlog/ and /dev/ installs have different themes applied.

Is this a domain caching issue? Is there something else I should be checking?

Thanks for any help.