So I am discovering that there are a number of things in a GTD file that can halt in mid-stream the ical sync.

1) If there is an item listed in the file with the completed tag around it. This is the biggest problem because when you cross out a to do in ical, then sync with GTDalt, the syncing process shuts down as soon as the first completed tag appears in the GTD file.

Here is the error output:

/Users/BAMWriter/Library/Application Support/TextMate/Bundles/GTDAlt.tmbundle/Support/bin/gtdalt_ical_synchronization.scpt: execution error: iCal got an error: NSReceiverEvaluationScriptError: 4 (1)

2) If there are two many blank lines between the last to do item in the GTD file and the tag "end."

3) If the GTD file is not saved prior to ical syncing, I get an error. 

Thanks.