â¢Â Lightroom 4 did not properly open external applications when using the âEdit Inâ functionality.
â¢Â Point Curve adjustments made in Lightroom 3 have been restored.
â¢Â Addressed performance issues in Lightroom 4, particularly when loading GPS track logs, using a secondary monitor, and the controls within the Develop module.
Keep in mind this is a release candidate, so it’s kinda like a step above beta. But if you’ve been having these issues, it’s probably worth installing. Oh, one more thing. You can’t install this along side Lightroom 4 – it’ll actually replace Lightroom 4. Again, here’s a link to tells you all about it. And here’s the link if you want to download from the Adobe Labs website.