I'm just trying out MyHeritage to see how it works. I added some of my information and exported it as a GEDCOM to make sure I could get my data out. Then when trying to import that GEDCOM file to another site to test it (ancestry.com), it says the GEDCOM is not valid.
I have some info in ancestry.com but they don't appear to allow you to export to GEDCOM (a requirement for me), but if the GEDCOM exported from MyHeritage is not valid, I have essentially the same issue.
I am also having the same problem. I maintain my tree on myHeritage & export it ancestry to search for records. It has always worked in the past but suddenly has stopped working since upgrade. I will ask ancestry for help to.
Error: The file you have specified (Newest gedcom try2.GED) does not appear to be a valid GEDCOM file, please try again.