For anyone wanting to fix the Sandra room bug (where you can't get into her room, even though you have the key copier), and are comfortable using Unren, follow the instructions below:
Use Unren to unpack rpa files, and decode rpyc files.
Open "\game\sociallinks\sandra.rpy" in a text editor
Add the following lines at line 15 (just before "elif sandra_door == True:"
elif sandra_door and thetimeofday == 1:
jump sandradoor
Be sure not to use tab characters, as Renpy doesn't like them.
Alternatively, you can create the folder "\game\sociallinks\" and copy the attached file into it. Renpy should use it instead of what's in the .rpa file.