The fix issues dialog box has blank prompts
It's working Ok for me here.
Could you give us some more info please:
Are you using CCleaner Free or Professional? Which version?
What Windows version are you using? (eg. I'm using Win 10 v2004).
What avtivirus/security software are you using?
Have you set any blocks for CCleaner/Piriform/Avast in your firewall or hosts?