In my case, I am trying to change @Home to @home. I have tried signing out and back in, trying to get the cloud to refresh. I have also tried not signing in for 8 hours (a forum post mentioned that the refresh happened after 6 hours) but all to no avail.
I have made sure that all instances of the tag used on task are of the lower capitalization, including completed tasks. Being a new Toodledo set up, this is quite easy since I haven't got too many tasks at this point.