Hi there,
Thanks for reaching out. We're sorry for the trouble with Lightroom. I'd love to help you figure this out.
Could you please share the version of Lightroom & the operating system you are working on? Does the select subject & vignette not work with a specific set or range of files? What type of images do you work with? RAW or JPEG?
Have you tried any troubleshooting steps?
Try the following suggestions and let us know if selections work better.
- Go to Lightroom > Preferences > Performance > Use Graphics Processor > Set it off if it is on Custom or Auto.
Please click on this link (https://lightroom.app.link/5Pdyw272qpb) to begin a tutorial from the Learn tab on Adobe Lightroom; you can continue to edit the image and test the Select Subject tool.
Similarly, follow this tutorial for Vignetting within Lightroom: https://lightroom.app.link/8iaqhgmZbsb
Let us know if this helps,
Thanks!
Sameer K