I think I found a bug in v0.4. If you interact with BunBun on Lincoln's bed before buying her from Lucy's shop, when you do buy Bun Bun and return to Lincoln's bedroom, the game kicks you out to the start menu, no error message, no anything - not even a game crash.
I had done all of the other scenes save for Smart Girl's blowjob scene, so that might have been part of the error as well.
Edit: And I realized that someone earlier had found this bug and said "You need to make a new save!"
Could someone please post a save file after the point of the bug please?
Edit 2: To the people who are having the problem with the 'error messages', just press the 'ignore' button when the error message pops up and you should be able to get past those errors and then you can watch the scenes in the gallery in Lincoln's room on the computer.