Hi,
We were just informed that some of the animations that we have were broken. We are not sure when did this happened. We are working with cdn. These animations were working for sure at 2020
On the other hand other animations are working like
Could you help us understand what has changed with the animations in the last year and where the regression could be coming from?
When you say from the cdn, do you mean from cdn.babylonjs.com? Because nothing changes there
Well technically we moved to 4.2 in April 2021 so yeah something changed 
can you repro the issue in the PG? (you can use version 4.1, 4.2 or 5.0 there)
It is almost impossible to help you without a correct repro (here is the entire list of changes: What’s New | Babylon.js Documentation (babylonjs.com))
When you say from the cdn, do you mean from cdn.babylonjs.com? Because nothing changes there
Yes
Thanks. I will check with 4.2.
Also FYI we’ll be releasing Babylon 5.0 in April so might be better to upgrade all the way to 5.0 we try our best to keep back compat but sometimes there have to be some changes
4.2.1 is better
Is there a way to ask the sandbox.babylonjs.com to work with a specific version of Babylon?
Because I just uploaded the file to sandbox.babylonjs.com and the animations are broken. It will be really convenient if we can try the sandbox with different versions.
The problem with the playground is that I have my files on a cdn that does not have Access-Control-Allow-Origin and thus we do not serve the files to playground.babylonjs.com. I will look if there is a place I could upload it without introducing an Access-Control-Allow-Origin to my server but having the sandbox and being able to select the version of babylon there will be super helpful
I kind of demonstrate it on playground.babylonjs.com https://playground.babylonjs.com/#0LC0DX#3
It seems that for all versions available on playgroud this animation does not work. With is very strange as this animation was working for at least an year a few months ago.
I checked further with authors of the lego instruction and it seems the animation was previously prepared with one version of blender and was 3 weeks ago changed to another version of blender and I guess there is a mismatch in the way blender was storing the information about the animation and the way it is storing it now.
Will further check.
Hi,
After testing with all versions of Babylon in the playground it seems not to be a babylon issue. I will be looking into where the issue is.
Thanks.
Glad to hear (Well at least from my standpoint ;)). Good luck with your bug search!
@kmitov you got me curious at “lego instructions” I can not wait to see what you are building
Oh, we’ve built it and plenty of people are using it. You can check out at buildin3d.com and then one of the major platforms that is using it - fllcasts.com
Niceee !!! keep up the good work there
Just wanted to let you all know that the animation is now working - it was not a Babylon issue - FLLCasts | Bag 6 - Weight Machine - FIRST LEGO League 2020-2021 RePLAY