Check out blog by Pansypotter, written on 16th April (yesterday) about her Yucca. Not quite the same ailment, but there may be some useful information on that thread for you. I hope this helps.

There is a varigated Yucca that takes on a red tinge in the winter time. Yucca aloifolia 'variegata'. I think the red tinge fades away in the summer. It looks like this is the type of Yucca you have.....if so, it is perfectly normal.

thanks Gilli, i was getting a bit worried, i will keep an eye on it.
regards scousemonk.(john)

thanks TT, i will have a look. scousemonk.(john)

Very beautiful.

I have a plant that looks like this Sm...but mine is Cordyline 'Torbay Dazzler', it turns a little pink like this from the cold, its in a pot so i can move it somewhere more sheltered...:>)