Hello Dundley and thank you for the report.
Can you please try these steps and let us know if the issue still persists?

• Go to the steam directory C:\Program Files (x86)\Steam
• Go to the userdata folder
• There are folders (or one folder) with numbers in their name
• These folders should contain folder named "7"
• Open the 7 folder and in it find a folder called "remote"
• Open the remote folder and delete serverbrowser_hist.vdf
• Do this for all the "7" folders (only applies if you have more than one number folder (step 3)

Regards,
Geez