Unreliable for background uploads

I really wanted to like this app, but even after multiple updates attempting to correct the issue, background photo upload is still very unreliable. Some photos arent uploaded at all and some are stuck in the upload queue after theyve already been uploaded.
If you only want to view photos, this is a 5 star app. But for auto backup of your photos look elsewhere.

Danny43223 about FlickStackr for Flickr, v3.10.2