well it seems like ftp server is misconfigured too..
since you are using beta 973, here is what you'll have to..
first thing is please enter your FlashFXP ID into your messageboard profile.
2nd is upgrade to build 975.
then you will need to go into configuration/administration for your linksys router and forward some port range to your computer. any ports between 1024 and 65535 is good..30-50 ports is a safe number.
then go to FlashFXP properties, Connection tab, check all 3 boxes in "Data Connectino" section, enter same port range you forwarded in your router and pick iplookup entry on the 2nd option.
once this is done, go back to site manager and disable PASV option you enabled earlier.
there is no need to post screen of your flashfxp. copy/paste of status log is equaly sufficient.