No problem here with FlashFXP v3.7.8 Beta & KIS2010 under Win7 x64 (nor with KIS2009 on another computer under WinXP).
If you are configured to not have popup when new programs need access to internet KIS will by default disable access. Maybe that's your problem. You can go in KIS options and give him access manually (or promote it to a more trusted level).
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