XL stops (not a crash though) when I select an effect in the sequencer window--ONLY when one of the sets of timing marks is selected in the sequencer. In the YT vid for which I posted the link below, when the "render style default" starts flashing at about 6 seconds into the video is the point at which XL stopped working. I have to close out of XL when this happens. I tried this with a couple of different sequences and it occurs consistently. I have found that this did not occur when I did not have any timing marks selected/showing in the sequencer--I can highlight and select an effect without any issues when there are no timing marks showing up in the sequencer . I attached my xml files for one of the sequences I am working on, in case there is something I am doing (usually the case) that I need to change. Any help would be very much appreciated!
https://youtu.be/gHFc4--qjHs