GTA V may go some way to making up for a history of neglected PC ports, but it seems that even the good ones aren't safe. A sizeable patch to the Steam version of the game has removed 12 songs from its radio stations, and reportedly broken some users' save files.
The mandatory update brings the game in line with the recent anniversary edition for iOS and Android, where Rockstar was unable to resecure the rights to classic tracks like Killing in the Name and Express Yourself. A similar situation occured with the PC port of GTA: Vice City, but old owners of the game were able to keep the originally licenced music; only new buyers were affected.
Reports of save corruption are mixed, with some users not experiencing any issues. Others, however, find that loading an old save restarts the entire campaign. Resolution problems have also been noted, with fan patches for 1080p and minor bug fixes having been overwritten. A beta update to the popular SilentPatch is already available, and seems to address many of the new complaints.
The patch isn't all bad - that 400mb does add 360 controller support and mouse steering for vehicles. You just won't be able to listen to some of the better songs when you're driving them.