Either it is not displayed correctly or it really doesn't work
I think it doesn't since most people still are mining i0coins at the pool.
discard that it does work there seems to be some delay.
Yes there was a bug.
It should switch almost immediately (process is running every 100 seconds)
But sometimes it didn't happen. Fortunately I found source of error:
some crucial variables weren't always initialized.
New version is in production now and it looks good. It managed to
switch back to i0c few minutes ago. And after few minutes back to btc.