Why can't I login to reseller account from a Macbook?

[texasdiver72]

I can login to the reseller CP at any time from my Windows desktop, but trying from my Macbook with the same login just refreshes the page.

I have tried Firefox, Safari and Chrome, clearing caches, etc and there is no difference. Try again on my desktop in Firefox and it simply works. I will be doing a lot of traveling soon and really need for this to work. This is not a new issue as I've tried occasionally for over two years. Until now it hasn't been all that important.

Just tried from my daughter's macbook and same result. Thoughts?

Added: Apparently trying to login this many times from my Mac has locked the account. Can no longer login with desktop either.