This issue is fixed in the latest development version. Please make sure to use download and install it - https://www.fosshub.com/Synfig-Development.html

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Can  you please upload those two files here?

Hello Lilameo!

Can you please attach screenshot of the error and the file that fails to open? Thank you!

Hello!

This is how to render to avi/mp4 file:

1. Choose File -> Render

2.  CHoose "ffmpeg" from "Target" dropdown.

3. Click "Choose" button and select destination directory for file. Also set filename and make sure it ends with ".avi" (or ".mp4). Click OK to close file selection dialogue.

3. Click "Render".

Hello!

Please check this tutorial to learn how to create circle using shapes - https://wiki.synfig.org/Doc:Creating_Shapes

And here is the second tutorial showing how to animate shapes -

1. Please download installation file from here - https://sourceforge.net/projects/synfig/files/releases/1.2.1/windows/SynfigStudio-1.2.1-32bit.exe/download

2. Run the installation file and go through installation steps.

After installation is completed, you can start application. Here is how to do that:

1. open start menu - hit button with Windows icon on your keyboard.

2. Type "Synfig" into search box.

3. An icon of Synfig will appear. Click on it to start application.

Did you installed Synfig?

Hello! Please let me know what is your operating system.