I cannot remember saying you need to buy a PC,   some peeps have several different devices, it was a suggestion , if perhaps you had one,  but hadn't tried that combo.

As @tobiasd4  says we are members just like yourself,  and can only pass on information we have gleaned from this forum , or from other members,  and a current issue does lie with Safari and eBay. 

The site is built around Chrome,  that's why it works a little better with eBay.

@pgovern