How do you draw diagonal lines in photoshop with brush tool?

[Bryce22113951ke28]

the regular way of using shift isnt working

[didiermazier]

There is a line tool You can choose Shape, path or pixel rendering and trace according to 45$ angle ,increments with Shift pressed

 

 

[c.pfaffenbichler]

Have you rest the Tool yet? 

What have you done for all-purpose trouble-shooting so far?
Restoring Preferences after making sure all customized presets like Actions, Patterns, Brushes etc. have been saved might be a good starting point:
https://helpx.adobe.com/photoshop/using/preferences.html
https://helpx.adobe.com/photoshop/kb/basic-trouble-shooting-steps.html
https://helpx.adobe.com/photoshop/kb/troubleshoot-gpu-graphics-card.html