I have installed PF3 and when selecting in FS9 everything seems to me ok until I try to access PF3 by selecting the assigned keyboard button then nothing happens
"If reporting a problem and possible bug PLEASE ensure you include all the files from your product's LOGS folder. These MUST be zipped and attached to your post. To do this you simply select 'Choose file' from the bottom left of the forum page when creating a post and then select 'Add the file' to complete the attachment."
My first guess: Do you have the latest version of FSUIPC3 (current version is 3.999z9) installed?