Paintbrush in Photo tool not painting

[bobdobbs]

I'm using Affinity 2.6 on a desktop Mac.

Within an existing multi-layered document I've created a new pixel layer.
I've selected the paintbrush tool and started painting, but nothing shows either on the layer or in the layer preview in the layers list.

I can see a visible area marker under the mouse.
I've set the tool's opacity to 100%.
Tool blend mode is set to 'normal'.

The layer is set to 100% opacity. Hardness is at 100%.
Layer mode is set to 'normal'.

The layer is toggled to be visible.
It is the topmost layer in the layer stack.

I don't think anything is wrong with Affinity itself:
If I create a new document and select the paintbrush tools on the same settings, then my painting will be visible on this new document.

What could I be missing?


 

Edited Thursday at 11:19 PM by bobdobbs
more detail

[Old Bruce]

Check the Context toolbar for Protect Alpha, if it is checked then no painting on clear pixels will occur. Check the Blend Mode, set it to Normal.

[bobdobbs]

>> Check the Context toolbar for Protect Alpha, if it is checked then no painting on clear pixels will occur. Check the Blend Mode, set it to Normal.

Blend mode is 'normal'.
Protect Alpha is unchecked.

[Old Bruce]

36 minutes ago, bobdobbs said:

The layer is set to 100% opacity. Hardness is at 100%.

What is the Flow set to? Does this happen with all a variety of brushes?

[bobdobbs]

>> What is the Flow set to? Does this happen with all a variety of brushes?

Flow is set to 80%
This happens with all brushes.

I'm not sure what flow is, but playing with the flow slider doesn't seem to change the outcome.

I haven't been able to figure out what the issue is, so I'm going to try to recreate this image from scratch after restarting Photo.
 

[R C-R]

A long-shot but double-click on the brush in the Brushes panel or on "More" in the context toolbar & check that Accumulation is not set to zero or a very small %. 

[Alfred]

2 hours ago, R C-R said:

A long-shot but double-click on the brush in the Brushes panel or on "More" in the context toolbar & check that Accumulation is not set to zero or a very small %. 

Wouldn’t that affect all documents, not only this particular one?

6 hours ago, bobdobbs said:

If I create a new document and select the paintbrush tools on the same settings, then my painting will be visible on this new document.

 

[iconoclast]

Could it be a hidden selection somewhere?

[Alfred]

21 minutes ago, iconoclast said:

Could it be a hidden selection somewhere?

Pressing Cmd+D will deselect any and all ‘marching ants’ selections.

[nickbatz]

Make a selection and the brush strokes are constrained to within it. That's not likely to be the problem.

It sounds like this particular file has a glitch, and my experience is that those almost alway go away when you restart the computer.

[iconoclast]

12 hours ago, nickbatz said:

Make a selection and the brush strokes are constrained to within it. That's not likely to be the problem.

It sounds like this particular file has a glitch, and my experience is that those almost alway go away when you restart the computer.

In my experience, it is a classic problem that small hidden selections cause such problems, because you can only paint on areas that are inside this selection, even you can't see the selection. I remember very well how often such tiny hidden selections drove me mad in my early Photoshop-Days. I'm not sure if it is the problem in this case, but as it seems, it is only a problem with one certain document. So I think that a restart of the computer will probably not solve the problem.

At least it would be easy and worth it to check out if there is a hidden selection.

[nickbatz]

11 hours ago, iconoclast said:

In my experience, it is a classic problem that small hidden selections cause such problems,

Ah. Yes, you're right. My bad.