Hi Stojan, I don't think there are too many sites on 12c so you and I are a bit at the bleeding edge of technology. If you can, post the relevant sections of your opatch logs here and I will have a look. The OCR master problem during patching is not new, I had the same when going from 10.2.0.4 to 11.2.0.1 on Linux. Took me a while to figure out... Martin -- Martin Bach Enkitec martincarstenbach.wordpress.com