I'm having an issue with the current beta app 14.7 build 18R.
When I use the Proxies/Create Proxies from either my BRAW or from mov files, the resultant file has no image, it's simply black inside and outside of Premiere. This is with the included proxy presets, both ProRes Lo-res proxy preset and the H.264 preset.
If I right-click/export the clip from the bin using the same preset as is used in the proxy preset, it produces a normal file. Which I can attach as proxy just fine.