Hello,
I like to report a minor issue with the RDM responder test HTML page, where the list lists are invisible. The list is populated; The 'add all' do bring the listed tests to the selected test list. Also, a scrollbar and vague gray lines are visible, but the test entries and invisible.
On a mouse-over, a test name becomes visible:
On inspecting the content, the entries reference an 'hidden' CSS class; can't remember the exact name.
This occurs on Raspberry Pi running most recent raspian image and up-to-date Chromium browser.