# Lightroom Classic freezes when launcing Negative Lab Pro

**URL:** <https://forums.negativelabpro.com/t/lightroom-classic-freezes-when-launcing-negative-lab-pro/5952>\
**Category:** Lightroom Classic CC\
**Created:** [February 17, 2023, 7:06pm UTC](https://forums.negativelabpro.com/t/lightroom-classic-freezes-when-launcing-negative-lab-pro/5952 "2023-02-17T19:06:08Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Jaap](https://avatars.discourse-cdn.com/v4/letter/j/a3d4f5/32.png) [@Jaap](https://forums.negativelabpro.com/u/Jaap)\
**Post date:** [February 17, 2023, 7:06pm UTC](https://forums.negativelabpro.com/t/lightroom-classic-freezes-when-launcing-negative-lab-pro/5952/1 "2023-02-17T19:06:08Z")

</div>

When I want to bring up Negative Lab Pro with ALT + N the plugin doesn’t start and Lightroom Classic immediately **hangs**.

When I reset the Preferences in Lightroom and reboot I can start Negative Lab Pro again. This has happened three times so far.

How can I resolve this?

- Windows 10 Home 19045.2546
- Lightroom Classic 12.1
- Negative Lab Pro v2.4.2

---

<div class="post-metadata">

**Author:** ![Jaap](https://avatars.discourse-cdn.com/v4/letter/j/a3d4f5/32.png) [@Jaap](https://forums.negativelabpro.com/u/Jaap)\
**Post date:** [February 18, 2023, 2:44pm UTC](https://forums.negativelabpro.com/t/lightroom-classic-freezes-when-launcing-negative-lab-pro/5952/2 "2023-02-18T14:44:43Z")

</div>

- Hardware acceleration is off by the way.
- Reinstalling NLP doesn’t help.
- NLP can also crash when I press Convert Negatives.
- I found another post on Lightroom Classic Freezing but the installer for NLP 2.4.2 fixed all that if I understand correctly

Can you please help me with this problem?