I'm still not clear what version you upgraded from. The other thread mentions 1.3.7 which isn't a version that we've released, so I'm not sure if that means 1.3.6 or 1.2.7 (or something else). If it's 1.3.6, then literally no code has changed related to the import code; even from 1.2.7, there are very few changes and I don't think they'd be relevant. Can you reconfirm the version?
Based on a screenshot in the other thread, I see the cron has been modified (at least to run every minute). I don't think the frequency modification should cause any issues. However, to test something, please disable the feed cron from running, wait 15 minutes. Then, with the feed cron entry, select controls > run. What does it display? Does it take a while to display anything?
I would note that I brought the feeds mentioned in the other thread in and it does appear to be working for me.