Context assist in DSLR Editor

I have been using drools 4 for couple of months now and I am starting to get the hang of it. We recently decided to move to Dools 5 with Eclipse 3.4.2 (Ganymede).
We unfortunately hit a major 'show stopper' (for us). In the DSLR editor: Context Assist + space + enter removes/replaces the whole line, not only the place holder.

In other words:

DSL:
[*][]Log :

{msg}=System.out.println("{msg}

");
[*][]id1="some id label"

DSLR:
rule "MyRule"
when
then
end

If I Press L , control space --> the line Log:

{msg} appears in the context menu. Hit enter I get
Log :{msg}

Now, If want to replace msg by id1. I position the cursor in the

{msg}

, hit ctrl space, id1 shows in the list. I hit enter the whole line disappear, and I am left with
id1
instead of
Log : id1

Is this a setting somewhere in eclipse itself?? I doubt it.
The same thing use to work as expected in Drools 4.

thanks.