Hoya macgillivrayi leaf problem.

I have this H.macgillivrayi leaf that has developed a white patch. The other leaves are O.K. and this leaf is still green on the back. I'm not sure if it's fungal or something is attacking it. I've asked the knowledgeable folk on Hoyas'r'us for a possible diagnosis. Click on picture for larger view. Thanks Roy.

Hoya lobbii

This Hoya has an unusual spreading habit, probably a hard one to grow for some one with limited space. It reminds me of a swooping bird. I suppose I'll have to prune it soon.