Transparency under Gimp2.10.6

[rich2005]

Sorry guys, my fault over enthusiastic editing of everything quoted over a one line reply.

I was peed off after making a comprehensive post on how you might get the reported problem when using layers and how the layer attributes in Gimp 2.10 will be the problem only to find

Not the layers, it is a single layer (I think) in normal mode and brush in darken mode which is different between Gimp 2.8 and Gimp 2.10

Solution as my previous post, put the brush in legacy mode.