We published a big new update for Melody Scanner last Thursday, june 13th.
Unfortunately, some users have issues signing in to the new version, this is caused by issues in the browser cache.
You can resolve this problem by resetting the browser cache on your device.
Here I have some instructions for you, depending on what platform and which browser you are using.
On Google Chrome:
If you still have any issues, please let us know and we will help you solving it.