I had the same kind of problem and now it seems solved!
I think it depended from a kind of conflict between a old version of the play store app and the FP operating system.
simply try to re-install the play store (and all the other google apps) via the Google Apps installer (it is present in your widget list)
(just for info. I have a FP 1st edition updated to cherry 1.6 but I did not (still) merged the 2 partitions)
hope it will work
ciao
Alessio