Hi, sorry to bother you again, but it appears I've run into an issue that seems to be new to the updated version of the 4.27 release - the one where you improved the UV precision.
All the VTF files I export from textures in Unreal turn out unusable now - VTFEdit says they're corrupted. I'm using the exact same pipeline I did before, exporting to DXT-5, making sure that the resolutions are correct and so on. The name of the updated release is "New VTF Lib", so I assume you've made some changes to the VTF import/export process. Either I need to change my settings in some way I haven't figured out, or the exporting is unfortunately indeed broken.
Edit: After reverting to the "Back To School" release I was using before and leaving the settings unchanged, exporting textures works again. Looks like it really is a problem with the "New VTF Lib" release.