using VC6 and 1424 i still cannot reproduce this. are you getting a suggestion (question mark icons) listbox or completion listbox? how are you accepting it? does this happen in a different cpp file? does it happen in a different project? any other plugins? anything that might be related or relevant?
I believe I was getting a completion listbox, and I was pressing Ctrl+Shift+W, which I have mapped to CompleteWord. I'm accepting it by pressing Tab. It always happens. No other plugins.
Maybe you are putting a space between the two? It happens when there is no space...