When a multithread test is in progress, the [STOP] button does not work properly, bringing up a 'Secure Connection Failed' error screen. When I hover my mouse over the [STOP] button...
... the address shown in the status bar has a ':80' after the domain name:
It affects the mobile website also, again bringing up an error screen when I touch [STOP], with the ':80' clearly in the URL it tried loading:
This issue also affects the upload test on the mobile website when Multithread mode is enabled (left image). The Express upload test also fails with Multithread mode enabled (right image):