I am still getting it this morning, just tried.
Clicking on the link does nothing, it's when I click on "Sign in" that I instantly get the Avast security warning.
I have been using that ebay link to sign in since I joined this site over 2 years ago and this is the first time this has ever happened.
I know I also had trouble with Viglink Leon had set up. Many others did as well, unbenounced to me, before Leon got rid of it.
I have no idea what the Avast warning means but I won't be logging in nor purchasing anything through that ebay link until it is corrected.
Just thought I'd let you all know.