Not a new bug at all. I get it all the time and I've had a Sony 505 for well over a year now.
It's caused by inadvertently pressing one of the numerical keys on the right side of the 505 when in the regular read mode. Since these buttons are inactive, in the reaf mode, when you press one, you get the 'page number' default. All you have to do to get out is pres the menu button once and you should be good to go
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