Hi Guys - we do not have any known technical issues with the app, but I would like to pass this information on to our mobile app team in order to investigate further.
Edit: If you are receiving an error when trying to log in, I suggest removing the app from your device and re-installing using this link:
http://www.payoneer.com/mobile/index.aspx
If that still does not work, please e-mail mobileapp [at] payoneer [dot] com and we will be able to assist you.