try opening up the console with shift + O and using
$ Paige.unlock_tittybank()
If that doesnt work then use
$ Cascade.unlock_tittybank()
This issue got corrected in the version I am currently working on.
that's because $ Cascade.unlock_tittybank() you need the 20 RS and that to be able to enter (no possible way to get 20 RS before this)
Not sure what the glitch in renpy is the coding checks out but for some reason cascade and Paige is wonky so in 0.28 I just took it out for them. By telling me you cant enter Cascade room though that narrows it down to the cascade code though :)