I play on the 360 and haven't seen the "still glows after picking" issue recently, so I assumed it was fixed by one of the patches.
Same here. I haven't seen it happen on the 360.
If you mean the atomic nirnroot, then your misinformed it most certainly does happen. If I walk past that nirnroot farm out by Rifton it looks like Vegas, and there are radioactive spots all over my map.
