My portulacaria afra is getting tons of new leaves but they're all light green and fall off easily. This is nutrient deficiency if I've ever seen it, but fertiliser doesn't help. Any ideas? I don't think it's sunstress, either.
I'd bet it's missing sunlight, those things thrive in direct sun.
Second guess is that it's overwatered... does that pot drain well the water? it should definitely not be sitting in water and I would not water it very often.
It can be a mix of both things