GIMP Version: 2.9.5
Operating System: Linux
GIMP Experience: Experienced User

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I am doing a rather involved layer blending project. I decided to go with gimp 2.9.5 to take advantage of the extra color depth. Everything went smooth so I saved as an XCF file. Later I reopened and tried to paint on the layer masks to do a bit of fine tuning. Brush, Pencil, Airbrush and Bucket fill are having no effect on layer masks or the layers themselves. I checked to make sure that I did not have an active but hidden selection, that pixels were not locked, that transparency was not protected.

I tried opening a new image and discovered that the paint tools are also locked up for that image as well. I am at a complete loss. Any ideas?

I'm a newbie so bear with me, have you checked the dynamics setting?