Tengu, the problems you are getting are because your paid subscription has run out. I am not sure what you mean by 'discount for concessions'. To seen PMs you need to empty your inbox so that you come in under the limit for normal members, you won't be able to see FM only sub-forums unless you re-new your full membership.
Andy, I don't know why you account should be showing full membership if your payment has lapsed, an admin will need to look at that.