Be sure you are using Resharper options to Resharper->Options->Intellisense->General
click Resharper
.
From Autopopup click Enable Automatic Intellisense popup
From Completion Characters check C#
From Completion Behaviour it should be like;
From Completion Appearance choose Visual Studio Intellisense font and click Show Summary.
From Parameter Info, it should be like this;
By the way, of course these are just my Resharper
options. Here how Resharper Intellisense seems on this options;