Mixing 1080p videos and 640x360 videos - causes crash - how to export them together as a new video?

Hi,

I have some intro graphics in 1080p (MOV files) that I want to add to a video that was captured at 640 x 360 in size - both are 25fps i believe.  I put them on the time line and tried to export to a new mp4.

I tried 3 ways:

1. just exporting to youtube 1080p HD - Result: just hangs at 1% and never finishes

2. set the project settings to 640 x 360, transform all clips to "fit to frame" and export to youtube 1080p  - Result:  just hangs at 1% and never finishes

3. set the project settings to 640 x 360, transform all clips to "fit to frame" and export to facebook 720p  - Result:  just hangs at 1% and never finishes

Is it possible to export in 640x360? How do I get it all out in a format for posting to Facebook and Youtube?

I know it's probable obvious how to do this or that I have to convert some files or something.  Could someone point me on the right track?

Thanks and God Bless!

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