I still havent tracked the exact file or location in the registery that it writes in when registered, find this entry and then you can probably re-register and the trouble would be sorted. My investigation leads me to think that when you registered during earlier versions this obviously seems to have set the registration from which the latest versions clearly cannot recognize the fact, so appears registered but inoperative. Flexify is fine, Flood is so so, Hue and Cry. Other singular plugins in the Flaming Pear product list can be variable. With the New Creative Pack, one key registers all, this appears to be the method adopted for sets of plugins when purchasing. The Designer Sextet which includes Aetherize has been the most troublesome, infact all the plugins which make up the Designer Sextet will fail more often than not by some quirk relating to issues of registration.
prior to these latest versions, then you will almost certainly encounter the problems in question from one or the other. Going to the Flaming Pear site and seeing the latest versions of their plugins, i can say that if you have previously installed and registered any of them.