Mono 4.0.1 autosuggestions incomplete?

Ok, so I am very used to monodevelop suggesting things as I type, for example if I type 'ga', monodevelop automatically pops up a list, with 'gameObject' at the top, to which I reply by pressing enter, and boom! ...time saved. Now it seems it does not do this and instead acts as though it has no idea what 'gameObject' means! What's more, after I finish typing 'gameObject', and press the full stop key, I am used to monodevelop showing me all the possible options for what comes next, such as 'collider', 'transform', 'renderer', 'SendMessage' and so on and so on, but now for some reason it stares onward and offers nothing, sighing as though 'gameObject' is an invalid word. Ok, so I usually know what I'm looking for, but I like being able to quickly scroll to the one I want without typing it every time. So what gives?

To really hit the nail on the head with the issue that made me come here to ask, I am using a project from the previous version of Unity, and I have the following line:

GUI.DrawTexture(new Rect(0, Screen.height - 100, Screen.width, RollDiceTutTx.height), RollDiceTutTx, ScaleMode.ScaleToFit);

Now, I want to add another texture directly after this one, to appear elsewhere, so I start typing:

GUI...... ok, why has mono changed 'GUI' to 'OnGUI', and even more bizarrely, why is GUI.DrawTexture not given as an option? So I have to literally type the entire thing while mono looks on like a clueless child, not suggesting anything or helping in any way? This is annoying! If I put 'aggressively trigger code completion list' on true, I literally cannot type half of the commands I want without them being 'autocorrected' to something completely off the mark by mono like a smart phone on steroids, and if I turn it off, mono suggests nothing and sits there comatose.

What the hell is going on?