Something weird is going on. Noticed it before 2.6, but came across it today at a larger scale:
If I use a local adjustment brush, it doesn't just affect only where I paint, but it does something (unrelated to the "effect" I', brushing in!) to the entire image: It clips highlights.
Example: Local adjustment brush "darken", before and after clicking once on the eye.
Notice the detail in the top of the mic and the shirt getting blown.
Before and after screenshots, to big to post here. My monitor profile embedded, so colormanaged browsers should display correct, but I think the difference will be visible anyhow.
Same happens if I set only exposure to -0.4, everything else "0".
The eye get's darker, other details (way, way away from the brush) get blown.
Same happens when I use a graduate filter.
Same happens if I click the top right corner for that matter...
So, in order to get the image about like I want, I have to use an extremer -EC grad in addition to the local adjustment brush I want to use... Still, it's not perfect, and detail that should be there, get's blown.
Mac, Dual G5, OSX 10.4.11