And even on the Apple you can see issues like this. I usually don't find any infection but a call to the bank to ask if they are working on it clears it up in the next day.
-> Be aware that some banks have ghost sites. For example:
kinect.com is not the bank's site. (fictious bank site)
kinect.org is their real site.
So you have to be very careful in the site name you go to because there are plenty of scammers out there.
In this case, call the bank and have them check the address you are using.
What should I do when Safari warns me that a site is not "valid," that it may be someone pretending? This is a bank that I have visited before. Safari also warns that the "certificate" was signed by someone not trustworthy. I was trying to change my email address. Makes me a bit nervous. Thanks for any comments.