Little bit different this time.

I have been writing an SQL Connection class, And I was writing a wrapper method for SQLSetProp()

=SQLSetProp(this.nHndl,

At this point Intellisense pops up a list of available SQL Server Properties.
If you move away from this list, and place your cursor on the character after the , and use Ctrl-J to get the IntelliSense list again, it shows a list of properties on the 'this' object. If you pick one off this list it then replaces the this.nHndl with what you chose, Yet if you choose nHndl again it puts some random ascii characters in.
Very strange