SubJunk, since it uses MT functions it's already incompatible with regular Avisynth, it will be incompatible with 2.5.8 MT due to new placement of MT functions, but there is nothing bad in it - 2.5.8 shouldn't be used anyway. If MT functions are called conditionally - you can still build it and maintain compatibility with 2.5.
2.6 will likely support 2.5 plugins without changes, but I hope they'll be recompiled if just to remove the ancient bad code that is compiled into all plugins and the main reason of "instability" of MT Avisynth mode.
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