Darktable not opening

[kofa (István Kovács)]

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I can't get Darktable to work anymore

Most software originating from Linux stores its configuration and data in a directory, which is not removed when the software is uninstalled (there is no registry like in Windows). Darktable is the same in this regard. Reinstalling darktable rarely helps (only if the software itself gets damaged, e.g. due to a hard disk failure). As @MStraeten said, this directory is C:\Users<username>\AppData\Local\darktable; if you rename that directory (e.g. to darktable.backup), it will be re-created with d…

However: recently many people on Windows reported issues.
The solution is usually to remove the “Microsoft OpenCL compatibility pack”.

darktable - driver timeout + black jpeg with blurs module

What version of darktable you are using? The current master has a significant number of improvements with OpenCL. Also, do you have Microsoft OpenCL compatibility pack installed (it could be installed by default)? I had to uninstall mine.