Weird...it's there for me, and you've already done everything I would suggest to 'get them back.'
Wondering if you went and grabbed an earlier version if they would be missing from there as well?
I was able to get the view snippets option back and open the snippet window by opening a connection and a worksheet. After the worksheet was open, snippets showed up in the menu. I tried to recreate this behavior with 4.0.2 and it was available with or without an open worksheet.
it SOUNDS like a library loading issue, where the library isn't loaded until a worksheet is opened - but i just tried this in 4.0.3 and was able to see the snippets before any worksheets/connections were opened