Font problem

I am hoping this is something simple and I have gone through the forums and can't find anyone else with a simillar problem.

I can't get corel draw x6 to create a "FF" as in Coffee. It happens in most fonts and as soon as you type ff they disappear from view and don't print. I can go into x5 and type it then copy and paste it into x6 as graphic text and it works fine. The only way I have been able to over come it is to put another charachter inbetween the f's then make it tiny and no colour and there you go I can create Coffee, Geoff, Affable and so on. Obviously this isn't ideal.

I have used corel since the early days and really like it and can use it pretty well but this one is just stumping me.

Any suggestions?