AltUI button has stopped working

The very top left icon showing “ALTUI” is not working with AltUI version v2.26.2405. Clicking on the icon using a Vera 3 or openLuup produces a malformed URL in FireFox and Chrome:

http://<IP_Address>:3480/data_request?/port_3480id=lr_ALTUI_Handler&command=home

Yes something strange
Reset home url variable then reload luup