Can't paint with left mouse button

[ZoltanE]

I don't know what happened but when it comes to the pen or pencil tools the left mouse button doesn't do anything anymore. I can still draw with the right mouse button, swap colors with X and so on. Chalk and Coal K work with both buttons.

[Martin Huber]

If Chalk and Coal are OK, you can compare their tool settings with the tool settings of the tools that are not working.

Common problems are a reduced intensity or an accidental turning off of all channels.

[ZoltanE]

Ahhh it was channels all turned off! Thank you for the help.