Found workarounds for the bug involving showing pictures to the nun and the one where you get stuck at the anime con:
For Rika pictures (I would save before showing her any pictures to be safe)
- Show her one picture, increasing the bar at the top to 20 as this will help you find what you need
- Close the game, and in your game directory (where the exe is located) go into records and you will see a list of files numbered one through ten. These contain your save data. Note: Folder 1 is the autosave file, so if you have your save on slot 5 for example, you want folder 6
- In the folder, open Record.dat in notepad and then use Ctrl + F to search for "SliderValue" and find the one that says "SliderValue":20 (assuming you followed step 1 here)
- Change it to 80, save the file, launch the game and then show her the one other working photo and you can progress
For getting stuck in the convention:
- Stop before going into the spot you get stuck and save, then close game
- Open the Record.dat for your save slot (exactly as explained above)
- On the very top line you will see "Position":{"X": ----, "Y": -----
- Change the X value to put yourself on the other side of the sticky spot. I found that using x = 400 puts you on the right side
- Save it and launch your save, you should be on the other side of that booth you get stuck at
- You'll have to do the same thing to get back across that spot. x = 200 will put you back on the left
It's an annoying process to get back and forth but it's what works
Edit: Make sure you're on 3.1.0, it was posted somewhere in here