There is no »Curve Tool« in Photoshop – are you trying to talk about the Adjustment/Adjuistment Layer »Curves«, the Pen Tool, …?
Please read this (in particular the section titled "Supply pertinent information for more timely and effective answers”):
https://community.adobe.com/t5/using-the-community/community-how-to-guide-tips-amp-best-practices/td...
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
Feature Requests (Idea) and Bug Reports are registered at Adobe, otherwise this is essentially a user Forum, though thankfully some Adobe employees do occasionally chime in.
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