Hi. On Kdenlive version 21.12.0 I'm trying to render a simple video with 2 video tracks and one audio track. There's was an MP3 music file on the audio track. I first selected 4K vorbis output and the result was white screen with audio. I changed to H264 AAC and got video but no audio. I tried several other options, getting video but no audio. I wondered if mp3 rights restrictions were causing problems so I converted the track to AAC, but Kdenlive didnt like it and converted it back to mp3, but made a mess of it and I only seemed to have half of the track, so I converted the original again to WAV. I got a white screen with audio. I've tried toggling between Export audio (auto) and export audio, to no effect, I've tried several format options with the same results, I've increased / decreased quality and processing threads but nothing works. It takes about 6 minutes to render the 5 minute video and I've done it 8 times now.
One of them caused a crash - I think it was when I tried 'lossless', and after that I had to remap the clip files at startup - lost files error. Did that break something?
In editing mode, everything works fine.
Obviously I'm missing something! Can someone help me out? Thanks in advance!

Okay, sorry, false alert. I shut it down and had a cup of tea and when I tried again, it worked.
No idea why. Maybe it was the tea.
If someone else has this problem, the tea was black Scottish Ceylan. I hope that helps.
Cheers anyway!