Or pink picture as in my case !
My workaround is this -
Tuned TV to work independently of Humax stb.
(New tv setup as you would without a Humax.)
Connected Humax via scart to TV to access programme recording facility, using 'ext' setting.
Now I watch most programmes using the 'TV' source setting in HD.
I switch to back to 'ext' source setting to watch recorded programmes.
TV direct access = No pink screen !!
ext via scart = No pink screen !!
I know it's more involved but I gave up looking for a 'solution''. At least this works !