I am moving a number of NOF 11 & NOF 12 sites to a new laptop (Win10, 64 bit) from a similar spec laptop but with slower processor, less RAM etc. I have moved 3 NOF 11 sites & 3 NOF 12 sites via templates. All NOF 12 sites work fine but I cannot edit Style in any of the NOF 11 sites. Both 11 & 12 have most recent updates. What am I missing?