Problems with large file trasnfers

[Ravefiend]

This could very well be a problem with your router. If I remember it correctly, my m8 had a similar thing and it was due to massive collisions on his home network, which increases with the size of the file. I think you need to look at if from that perspective, and not FlashFXP specific.

Cheers,
Pieter aka Ravefiend