I have tried "ALL" the options described above (including using a MAC and Windows desktop) both running the Yahoo stand alone App and the web-based option.
After all tries, I deleted and re-created the IM+ Yahoo Messenger account on my IPAD. It still does not connect and I get the same message (Connection failed ... blah blah blah ... review Terms and Conditions ... etc).
It's not that $4.99 was a big price to pay, but I REALLY LIKED this APP when it WORKED.
Please provide a fix.
Thanks.