Lightroom cannot start because it cannot create files in the temporary file location

Hi,

I have exactly the same problem and even more. Also, Photoshop will not launch unless run as an administrator. Like you, under the same account, I can create files in the target Temp folder. Any other application can. Not Lightroom. LR obviously has a problem with NTFS partitions and permissions. That's easy to demonstrate :

- My temp folders have been moved to a dedicated NTFS partition but this was not enough to solve the problem. All aplications and Windows could write to the Temp folders there. Just LR couldn't.
- Reformating that partition as FAT32 fixes the problem. Ahem, this fixes the problem for the temporary files....
- But if I try to create a catalog on another NTFS partition, LR fails claiming that I have no permissions to write there (although a lot of applications on my system are writing data there - so the error message is absolutely wrong).

- I have checked the permissions for all the concerned folders : no problem, all users have full rights on these folders and partitions.

The problem is similar with Photoshop. This is not a new issue but a long lasting bug affecting both LR and PS and probably other Adobe apps. It's time to do something about it.

The only workaround is to change the executable properties in order to have the program automatically launched as an administrator (right-click photoshop.exe or lightroom.exe | Properties | Compatibility tab | Check Run as an adminsitrator). Being forced to use an application as an administrator is not secure, especially because these apps are constantly exchanging data on the web. This should not happen and no mainstream application should need this. That's unacceptable.

This bug is obviously related to the system configuration and probably to the UAC. So, it may or may not appear depending on the user's choices in this area. But this is in no way due to incorrect permission settings or to unsufficient disk space. Even when the permissions are correct, the problem may occur. It's an issue with the PS or LR code that cannot deal with the NTFS security properties.

Windows requires 20%-25% of free disk space at all times to function properly. If your hard drive only has 20 GB available, it is quite possible that you don't have enough space available for Windows to to function, and therefore Lightroom and Photoshop cannot function properly either. You probably need to find a way to provide more disk space by moving some of your data to an external hard drive.

Hi there, 

We are sorry about the experience with Lightroom due to the permissions error. If the application is working properly by launching the application as administrator, it seems like the issue is due to permissions on the application folders.

Please grant permissions to the folders at the below mentioned locations manually and then restart the computer to check if that helps.

C:\Program Files\Adobe

C:\Program Files (x86)\Common Files\Adobe

C:\ProgramData\Adobe

If you still face issues, please create a new user account on the computer with Admin rights and check if the issue persists in that. You can check: https://support.microsoft.com/en-us/help/4026923/windows-10-create-a-local-user-or-administrator-account

Regards,

Nikunj