The ouptut you're getting with $ssh2->scp_get($old, $new) differs quite markedly from what I get. I'm running with $ssh2->debug(1);, and I gather you're doing the same ?

My particular code segment, which is doing the job fine, is as follows:

for(@files) {
   $ret = $ssh2->scp_get("$dir/$_", "$_");
   print "RET: $ret\n";
}
[download]

My @files contains 6 filenames, and the output that segment produces is:

libssh2_scp_recv(ss->session, path, &st) -> 0x3dae38c
Net::SSH2::Channel::read(size = 506, ext = 0)
- read 506 bytes
- read 506 total
Net::SSH2::Channel::read(size = 1, ext = 0)
- read 1 bytes
- read 1 total
Net::SSH2::Channel::DESTROY
RET: 1
libssh2_scp_recv(ss->session, path, &st) -> 0x3dae38c
Net::SSH2::Channel::read(size = 500, ext = 0)
- read 500 bytes
- read 500 total
Net::SSH2::Channel::read(size = 1, ext = 0)
- read 1 bytes
- read 1 total
Net::SSH2::Channel::DESTROY
RET: 1
libssh2_scp_recv(ss->session, path, &st) -> 0x3dae38c
Net::SSH2::Channel::read(size = 499, ext = 0)
- read 499 bytes
- read 499 total
Net::SSH2::Channel::read(size = 1, ext = 0)
- read 1 bytes
- read 1 total
Net::SSH2::Channel::DESTROY
RET: 1
libssh2_scp_recv(ss->session, path, &st) -> 0x3dae38c
Net::SSH2::Channel::read(size = 507, ext = 0)
- read 507 bytes
- read 507 total
Net::SSH2::Channel::read(size = 1, ext = 0)
- read 1 bytes
- read 1 total
Net::SSH2::Channel::DESTROY
RET: 1
libssh2_scp_recv(ss->session, path, &st) -> 0x3dae38c
Net::SSH2::Channel::read(size = 570, ext = 0)
- read 570 bytes
- read 570 total
Net::SSH2::Channel::read(size = 1, ext = 0)
- read 1 bytes
- read 1 total
Net::SSH2::Channel::DESTROY
RET: 1
libssh2_scp_recv(ss->session, path, &st) -> 0x3dae38c
Net::SSH2::Channel::read(size = 493, ext = 0)
- read 493 bytes
- read 493 total
Net::SSH2::Channel::read(size = 1, ext = 0)
- read 1 bytes
- read 1 total
Net::SSH2::Channel::DESTROY
RET: 1
[download]

I'm thinking it's the Net::SSH2::Channel::DESTROY that occurs between successive scp_get() calls that might be critical. I'm using Net-SSH2-0.19 (built against libssh2-1.0).

I haven't tried grabbing large numbers of files - and if I did, then faik I might well strike exactly the same problem as you.

Cheers,
Rob