Hi Ciaran,
that worked - thank you

Hello

Thank you for detailing the issue with your video.

To amend try adding the following to the Custom CSS field of your templates parameters (Extensions -> Templates -> [YourTemplateStyle] -> Custom CSS)....

.hornav > ul > li > a:hover {

    color: #888 !important;

}

That failing try the following instead...

.hornav > ul > li:before,

.hornav > ul > li > a::after {

	display: none;

}

Ciaran

Thank you for your help.
The version of safari is 13.1.2 (15609.3.2) on Mac Catalina 10.15.6 Beta
You can view a video of the issue in action at
https://www.icloud.com/attachment/?u=https%3A%2F%2Fcvws.icloud-content.com%2FB%2FAdmMJQC14O3ujLPcEVwrt2FWZbNmAacnjFoDuYsgU06vrbmvjSrADztY%2F%24%7Bf%7D%3Fo%3DAjgH8BOPCtfLIN2lHWpnO8e1OLB2223-3vHXPI8_dbwL%26v%3D1%26x%3D3%26a%3DCAogH9spUNP_02DsneyGpIuzquKO6EjpTVSCcPJzcZUamYESdRDWuM_0ry4Y1sjKyLkuIgEAKggByAD_Btdbd1IEVmWzZloEwA87WGolBbh90qlvOfmJ3X-vZ1dGcPOyA4Ihbu60qHqz2nGNPrxM3_pCp3IlTJC-Xh4_o12S1qd69B2rEa2Giji6abJqsfi043Lr7mMhtLIEhQ%26e%3D1596001002%26fl%3D%26r%3D9B0F5B65-9CC9-4003-849B-34214299D900-1%26k%3D%24%7Buk%7D%26ckc%3Dcom.apple.largeattachment%26ckz%3DB9F19D15-C26D-4E7D-96DE-102B01652AB7%26p%3D29%26s%3DLw0DGzQtzkB279um0yV642CNGHo&uk=_IcBmMAI1lzivaUHVLsc2w&f=Safari%20Menu%20Issue%202020-06-29%20at%203.28.15%20pm.mov&sz=125152934

Hello

May I ask what version of Safari are you having this issue. We are unable to replicate with the latest version (13.1).

Ciaran

Apparently it didn't resolve it - any other ideas?
The menu links appear normal when a user scrolls down (given that we have the sticky menu activated) - but it is just when the menu is at the top before one begins to scroll down that the issue appears.

Hello

Admittedly we are unable to replicate this issu so this is a bit of a shot in the dark. To amend try adding the following to the Custom CSS field of your templates parameters (Extensions -> Templates -> [YourTemplateStyle] -> Custom CSS)....

.hornav > ul > li > a:hover {

    color: #454545 !important;

}

Ciaran