Quite often with FTP while looking through a list of jpg images, Opus will freeze with the viewer pane saying "loading...". Even when files are <1mb. It will usually hang for several minutes but sometimes it goes to a white screen and I have to kill dopus. Here's the FTP log:
--> PASV
227 Entering Passive Mode (69,163,144,228,181,165).
--> RETR P1050416.jpg
150 Opening BINARY mode data connection for P1050416.jpg (199084 bytes)
196608 bytes received in 0.156 seconds (1230.480 Kbytes/sec)
226 Transfer complete
--> PASV
227 Entering Passive Mode (69,163,144,228,165,224).
--> RETR P1050417.jpg
150 Opening BINARY mode data connection for P1050417.jpg (289608 bytes)
226 Transfer complete
** CloseFile NO FD_CLOSE Response from Server **
360448 bytes received in 71.651 seconds (4.904 Kbytes/sec)
Connection closed
This example froze just after the last "226 Transfer Complete" message, waited about 5 minutes, then gave the closefile message.