Partly a bug report, partly a solution.

The Flash plug-in supplied is version 11. Unfortunately, that has been compiled to use sse2, so it won't work on a Pentium III (or earlier) or on most (all?) 32-bit AMD and VIA CPUs. The solution for the distro is probably to switch to Gnash. For the user, if you find that Youtube isn't working with AntiX 12, the least messy solution is this:

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You can use a older version of Adobe flash also after uninstalling flashplugin-nonfree in terminal as root first.

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Your mileage may vary from mine depending on your hardware.