to expand a bit on what Mouton said,
if you are using Quick Connect, queue some files and start transfering, then start another instance and add a bunch more sites to Quick Connect, eventually info about site from which you are transfering will get pushed out of Quick Connect history.
to solve this issue you can
stop connecting to so many sites (pubs i'm sure
)
add that site to Site Manager
modify flashfxp.ini to increase the size of quick connect history, info on that is located in FAQ forum