The presence of Auto Kern in a converted document shouldn't stop it from playing. At most it should just generate a warning when you publish. That's all that used to happen.
Well, that being said, try copying this script into a .jsfl file and running it when your document is loaded. It should strip all the auto kerning from a document. Not extensively tested, but seems to work.
function main() {
var dom = fl.getDocumentDOM();
scanLibrary(dom.library.items);
scanTimeline(dom.getTimeline());
alert("Scan complete!");
}
function scanLibrary(libItems) {
var i, item;
for (i in libItems) {
item = libItems[i];
if (["movie clip", "graphic", "button"].indexOf(item.itemType) != -1) {
scanTimeline(item.timeline);
}
}
}
function scanTimeline(timeline) {
var layer, frames, element, member, frameSet, elementSet, memberSet;
var layerSet = timeline.layers;
for (layer in layerSet) {
frameSet = layerSet[layer].frames;
for (frame in frameSet) {
elementSet = frameSet[frame].elements;
for (element in elementSet) {
changeText(elementSet[element]);
memberSet = elementSet[element].members;
if (memberSet != undefined) {
for (member in memberSet) {
changeText(memberSet[member]);
}
}
}
}
}
}
function changeText(item) {
if (item.textRuns) {
for (var txt in item.textRuns) {
item.textRuns[txt].textAttrs.autoKern = false;
}
}
}
main();