Does syntax highlighting work for you? Both of these features are part of the 3rd party scintilla control that I'm using in the project.
I'm working on a separate installer that will remove the ClickOnce dependency (Microsoft's .Net deployment management package). This will move all the files to the "Program Files" folder which may help with some of these issues. If syntax highlighting does work but auto-complete does not, then I'm at a loss as to why this would happen. Without an environment that I can replicate this it's hard to figure out what's causing it. What is your client OS?
-Joe
Nimbostratus