It’s a shame there isn’t a command to render each selected track individually - thereby avoiding the user having to to select each in turn and render it one at a time.
I have a vague memory of submitting a GitHub enhancement request for this but I can’t find it right now.
Update
Ah, here it is:
Proposal: add a new Tracks menu command for rendering tracks #2418
https://github.com/audacity/audacity/issues/2418
I have just given this a little bump …
Peter.
I’ve not read the rest of this thread, but couldn’t you label each clip and use Export Multiple? (If there are multiple tracks you would need to do one track at a time by muting the other tracks).
Great!! Thanks 
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I’m wondering how these two tracks (all 32-float, 44100Hz) became misaligned:
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Ideas, anyone ?
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Here is another place along the same tracks, and yes, they are butted against each other as closely as they will go.
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Hi Jademan,
I am working on another project. I was having the same issues with envelopes randomly popping up on the tracks so I did the mix and render on each track.
This worked up until the point where I am at now. (I have inserted my intro and outro music into track 3 and I was able to add envelope points easily at the start of the track for the intro no problem).
However, now that I have split the music (track 3) to add music as the outro for the project, it will not let me insert any envelop points to the end of the track.
When I click the track to insert an envelope point nothing happens (this was happening after a while on all of my projects previously too - this is not a new issue_.
And after I zoomed out of the end of the track to see the entire project I have noticed that extra envelope points have been added to the intro and the points that I put in have moved. It sounds all weird.
I will zip and send this to you now
Do you think this is something that will be fixed soon?
Wondering what other options I have to be able ot continue with my work.
Thanks so much
Anna
Possibly because you have no audio at the end of track 3 (Inspiring Upb)? BTW, I have no difficulties adding envelope points to the end of track 2 (Audio 1).
Hi Jademan, it’s track 3 that it was happening on, not track 2.
Split the audio in track 3 roughly in the middle and then move it to meet the end of track 2 and then try to put envelope points in…
I undid all of this and saved so that you could follow the steps I took
Thanks. 
You mean like this ?
yes - hmm, looks like it worked for you… it won’t let me put envelope points in whatsoever for that end part of track 3 after I split the audio
Not sure why mine doesnt work…
I wonder whether it has anything to do with other edits I have done before the split, What do you think?
okay so I just opened the project and followed the steps I had given to you (to show you the issues and try to explain further) and it miraculously is now allowing me to put in the envelope points at the end of track 3 after the audio split.
I had tried closing and reopening the project earlier today and this did not fix the issue but this time I shut down Audacity completely before reopening the project and it has worked.
Just letting you know that whilst it’s working now on this project but this has definitely been another ongoing issue where suddenly the envelope tool will show as being “on” or “open” but when I click on the line, no envelope points occur.
Yes. So I am continuing to look into this issue. It is particularly befuddling as it seems to occur intermittently. I am also concurrently juggling real-life issues so I can only spend time on this when I have it.
I have given you some tools to use. I’ll let you know what else I find here. Have a good weekend. Later…
Hi Jademan,
Yes it’s all intermittent. Definitely befuddling!
Thanks, hope you have a good weekend too
OK, sorry this took me so long. I had a busy weekend which spilled over into much of this week.
I had to dig through my old tools to be sure what was happening here. Your project actually has the “Envelope Control Point Bug”, which we saw last year and we thought had been fixed in 3.0.5. But alas! I was wrong.
The bug has now been documented and turned over to the developers here: They're back. Envelope Control Points. Millions of them. · Issue #4070 · audacity/audacity · GitHub
Until this issue can be fixed, let me suggest doing a Mix and Render on each track. And if you have a project that you are copying in audio from, do a Mix and Render on the track on that old project before the copy.
Hi Jademan, thanks for organising that.
Just to let you know that I even after a mix and render on each track, eventually the problem begins to reoccur (again, it’s random and not immediate).
would you suggest mix and render each time this happened?
Also, had to laugh at this minor exaggeration haha:
"Expected behavior
less than a million envelope points
Actual behavior
12,367,872 envelope points 
"
Actually it is not an exaggeration. 
I’m already checking into this…
Done.
Yes. So here is an internal representation of part of your project with those 12 million envelope points after a mix and render:
<wavetrack name="maz-from-the-bam-fam_recording-4_2022-11-22--t09-32-46am--632d0953e6cdf30f6b5c3979--anna_britstralian" isSelected="1" height="176" minimized="0" channel="2" linked="0" mute="0" solo="0" rate="48000" gain="1.0" pan="0.0" colorindex="0" sampleformat="262159">
<effects active="1"/>
<waveclip offset="0.00000000" trimLeft="0.00000000" trimRight="0.00000000" name="maz-from-the-bam-fam_recording-4_2022-11-22--t09-32-46am--632d0953e6cdf30f6b5c3979--anna_britstralian" colorindex="0">
<sequence maxsamples="262144" sampleformat="262159" numsamples="50765940">
<waveblock start="0" blockid="11321"/>
<waveblock start="262144" blockid="11322"/>
...
<waveblock start="50331648" blockid="11513"/>
<waveblock start="50593792" blockid="11514"/>
</sequence>
<envelope numpoints="0"/>
</waveclip>
</wavetrack>
Here is the key: 0 envelope points. I’m hopeful that will keep them out.
Right now, I suspect you copied the envelopes points in from some previous project. So next time, clean up that old project BEFORE you copy to the new project.
And yes, processing 12 million envelope points will cause your project to “appear” to hang.
Let me know if this happens again.
perfect, thank you.
Wow thats a lot of envelope points!
I probably need to do a new thread for this next issue - unless I am somehow inserting this playback loop without realising it…?
Every now and then (again, no obvious rule as to when this happens and it is occasional) - a playback will form like this (see the blue highlighted section on top of the top track in the picture).
So that I can work out if it is a bug (or my mistake) - please can you tell me how you would normally create these ‘loops’ on a track?
Secondly, how do i go about deleting / removing them?
thanks again,
Anna
Right-click (or two-finger tap on a trackpad) then select “Clear loop” from the menu.
The looping region is created by dragging in the timeline.
– Bill
Thanks Bill. Have removed easily and have a feeling this could be my error in creating it manually - will keep an eye on it!