In VLC 3.0.1 to 3.0.6 (and 3.0.7 nightly for that matter), when using Open Multiple Files dialog to play a video file and an external audio file (using Play another media synchronously checkbox), the program won't work correctly:
1) firstly, it won't play any sound after you switch audio track to Track 2 until you skip to any frame using timeline, and then sound starts playing but video and audio start from the very beginning;
2) secondly, if you'll keep trying to get to specific position using timeline the program would crash on 2-3 time.
This makes VLC unusable because you have to play video with external audio in one go. Please fix this. I've tried this with different files (specifically, MP3, FLAC, MKA audio files with MP4 and MKV video files) and it's broken.