I think they fixed it -- I'm using 7.38.0.101 and it worked for me.
Unfortunately the update came in the middle of an important call with no warning. I really don't appreciate that they would break my call with no warning and then make me wait minutes for the update to install before I could resume my call. Besides that,
they didn't apparently notify anyone of the fix. Not very professional in my opinion.
A friend of mine said that Viber is a good alternative. Anybody here use it?