Hi Ian,
Good to see you back
I haven't heard of anyone else having a problem getting into the Users Guide. Did you restart your machine after installing the update? Sometimes Windows needs that to get it's ducks in a row.
For hiding the meter, there is a bug that if the meter is the last measure that changes meter from a previous meter and there's a repeat somewhere else, it won't hide. The work around is to change that last barline to a dashed or dotted one. I realize that this isn't the "prettiest" work around, but the dashed barline is not too bad.
If the above doesn't explain either situation, let me know. For the meter one, you can send along the file and let me know which meter won't hide so I can check it out.
Thanks!
Sherry