Same issue over here. Server: Licensed CoreFTP with ssh2/sftp and only write and append rights. Same setup as in this post:
http://www.coreftp.com/forums/viewtopic.php?t=357756
Non-silent resumes perfectly. Silent starts from the beginning. Normal windows client resumes as well.
Client: CoreFTP Pro (bought today).
In the logs no REST output can be found:
Silent:
SSH-2.0-CoreFTP-0.2.1
client -> aes128
server -> aes128
bf:5e:e6:86:c8:7c:3e:5f:etc
ssh-rsa
Sending password
PWD
Current directory is '/'
CWD /
STOR /cx160sd.flv
disconnected
cx160sd.flv - 2588672 bytes transferred
Total uploaded files: 0
Total uploaded data: 2,528 KB
Not silent:
SSH-2.0-CoreFTP-0.2.1
client -> aes128
server -> aes128
bf:5e:e6:86:c8:7c:3e:5f:etc
ssh-rsa
Sending password
PWD
Current directory is '/'
Transferred 0 bytes in 0.008 seconds
STOR /cx160sd.flv
disconnected
cx160sd.flv - 1277952 bytes transferred
Total uploaded files: 0
Total uploaded data: 1,248 KB
I stopped both transfers prematurely. The non-silent mode apparently lists the homedir (which returns nothing, because there are no list-rights on the server). The silent mode does not output something like 'Transferred 0 bytes in 0.008 seconds'