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List of issues
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#1683 [Internal viewer] Flash preview executing AS
Labels: Script execution
Flash preview (and animated sprites too) render frames continuously, ignoring any stop(); (and AS entirely, I guess). Happens in all versions up to 14.4.0 for AS1/2 and AS3 flashes. Is it unimplemented feature, rather than bug? Another issue, not sure if related: only top-level timeline of a sprite is rendered, but all sprites contained within are not animated.
Internal viewer has very limited (pretty unusable) experimental support of AS1, it can be enabled in Advanced settings "AS1/2 in own flash viewer (Experimental)". But most of the actions won't work. "stop();" should work. We do not plan to enhance it much. The second issue is unrelated - it would be better to create separate issue for it - please create it and attach sample SWF file with such sprite.
Title: [Internal viewer] Flash preview ignoring AS→[Internal viewer] Flash preview executing AS