The different (arrangement) editor profiles each keep their quantization and snap settings.
The arrangement editor is the only one affected, and looking at the editor profile structure, I think I understand why it is this way.
Maybe it does have some advantages, but to me it has become quite annoying lately. 🙁
Side-notes: This also applies to the selected tools across profiles. For this, I can see a little more use, though.
Another smaller problem also related to profile switching is that the CPU indicator is reset every time, and the faded overload color with it.