Visual Studio 2010 IntelliSense -> Enter will not AutoComplete any more

I had same problem, but I found a fix.

In VS 2010 there is new suggestion mode, what is good, sometimes, but most of times it's not. So when autocomplete box is shown, press crtl+alt+space to go to old mode. And if you need go back to suggestion mode, press crtl+alt+space again.

In VS2017, for C++ at least, go to

Tools/Options/Text Editor/C/C++/Advanced/IntelliSense

and change Member List Commit Aggressive to True

Also you can use TAB instead of Enter.