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'System.ExecutionEngineException' occurred in WindowsBase.dll parsing Run in separate thread

Posted By:      Posted Date: September 08, 2010    Points: 0   Category :WPF
Receiving the above exception when attempting to fire off a BackgroundWorker and parse the FlowDocument via Run. Sometimes does not reference WindowsBase...as such Exception of type 'System.ExecutionEngineException' was thrown. Some key things are that if I run the exact same code on the UI thread there are no issues at all. If I run the code as a BackgroundWorker and the document is very small, no issues will surface either...although that may be a timing issue masking itself. Below is the entire parsing class...things begin in the method at the bottom the ParseRuns method.   public class Parser : IParser { private void OnDoWork(object sender, DoWorkEventArgs e) { ParseRuns(e); } private void OnWorkComplete(object sender, RunWorkerCompletedEventArgs e) { ParserHandler handler = _parsingHandler; if (handler != null) handler(this, new ParserArgs((e.Result as List<Data>)[0].Words, (e.Result as List<Data>)[1].Words, e.Error)); } #region IParser Members private ParserHandler _parsingHandler; event ParserHandler IParser.ParsingCompleted { add { _parsingHandler += value; } remove { _parsingHandler -= value; } } void IParser.Parse(FlowDocument origText, FlowDocument modifiedText) { //nothing to do with null if (origText == null || modifiedText == null) return; //ParseUIThread(origText, mo

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