Numerous AVM2 "Daum Kidszzang" games no longer progressing on the loading screen

[jmousy]

Describe the bug

There are approximately 100+ games from Daum developers (Developer called 'Daum Kidzzang', korean name is '다음 키즈짱') that are affected.

When you launch the game in Ruffle, it will no longer progress past the loading screen. It will work fine in Adobe Flash Player.
This does not appear to be caused by any self-protection code in the Flash file or restrictions such as site lock.

If you check your web logs, you'll see something like this:

INFO core/src/context.rs:344 Loaded SWF version 9, resolution 800x600 @ 24 FPS
WARN core/src/stub.rs:144 Encountered stub: AVM2 flash.display.MovieClip.goto() with SWF 9 movie

Checked on Ruffle Nightly 2025-04-18 (Desktop app & Web self-hosted)

Expected behavior

After the loading screen, game should be taken to the main screen.

Content Location

The symptoms are the same for all, so I'm only attaching 2 files from some of the affected games.

daum_kidszzang_games.zip

Affected platform

Desktop app

Operating system

Windows 11 24H2

Browser

Google Chrome latest

Additional information

No response

[danielhjacobs]

This is a regression based on your phrasing, right? Do you know when the last working version was?

[jmousy]

It doesn't appear that this was previously working (although I haven't reviewed all the dates), and using builds from 2024-04 / 2025-01, the issue was the same.