Important: This solution is only for Lightroom 5.5 on Windows.
Note: Make sure you install the appropriate file into the appropriate version of your operating system.
To replace the old ui.dll file with the new one:
1. Open Lightroom 5.
2. In Lightroom, go to Help > System info.
3. Note the Application architecture (x64 or x86).
4. Note the Application folder name. This is where Lightroom 5 is installed. The default is C:\Program Files.
5. Exit Lightroom 5.
6. If your Application architecture was x64, click on the x64.zip link below.