Using Lightroom Ver 6.0
All of the sudden my Sony RAW files are not recognized.
Files created a month ago are recognized.
Lightroom version: 6.0 
Operating system: Mac OS 10
Version: 10.9 
Application architecture: x64
Logical processor count: 2
Processor speed: 2.4 GHz
Built-in memory: 8,192.0 MB
Real memory available to Lightroom: 8,192.0 MB
Real memory used by Lightroom: 390.2 MB (4.7%)
Virtual memory used by Lightroom: 2,065.5 MB
Memory cache size: 24.9 MB
Maximum thread count used by Camera Raw: 2
Camera Raw SIMD optimization: SSE2
Displays: 1) 1440x900
Graphics Processor Info:
NVIDIA GeForce 9600M GT OpenGL Engine
Check OpenGL support: Passed
Vendor: NVIDIA Corporation
Version: 3.3 NVIDIA-8.24.16 310.90.9.05f01
Renderer: NVIDIA GeForce 9600M GT OpenGL Engine
Application folder: /Applications/Adobe Lightroom
Library Path: /Volumes/SeagatePhotos/Seagate HD/Lightroom 5 Catalog/Lightroom Catalog.lrcat
Settings Folder: /Users/jimsimp3/Library/Application Support/Adobe/Lightroom
My Lightroom did handle the Sony A6300 RAW files until recently. I now remember that I had to reinstall it about a month ago because of an issue. The install version was 6.0 and not the latest.
That caused my issues.
Thank you, F. McLion for your suggestion. It now works after updating to 6.10
Before LR6 every .x version was a full installer. Since LR6 .x versions are only (cumulative) upgrades. Therefore, you always need the 6.0 base installer and the latest patch.