I've always preferred to use the automatic upper case file extensions option for my .DNG files, and have discovered that it's no longer working in LR CC. The option is still listed and checked, however all my file imports are coming in with lower case extensions. Would love to see this fixed ASAP.
Yeah, that happens with me. This is a user-to-user forum in which Adobe infrequently participates. You can file a bug report in the official Adobe feedback forum: Recently active topics in Photoshop Family about Photoshop Lightroom. Adobe says they read everything posted there, and they do often (but not always) respond.
Same issue after upgrading to CC. Would love to know if anyone finds a fix, or a way to report a bug.
You can file a bug report as described in my previous message.