After installing 218 for VS2005 I finally had AutoComplete working: on
typing, after dot, no problem.
After an hour or so AutoComplete suddenly stopped working again. No
suggestions after typing, no suggestions after dot.
However, when I type the first characters and then press Ctrl+Space, a popup
with correct suggestions appear.
After restarting VS (which is no fun, as R# takes a very long time to start
after opening a solution) it all worked again.