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edited, had pasted non-relevant lines.
Have you reset the Tool yet? Could you please post screenshots with the pertinent Panels (Toolbar, Layers, Shapes, Options Bar, …) visible?
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.htmlhttps://helpx.adobe.com/photoshop/kb/basic-trouble-shooting-steps.html