WinScp 5.7.6 can't use saved passwords

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WinSCP Version 5.5.2 (Build 4130) (OS 6.1.7601 Service Pack 1 - Windows 7 Professional)
Configuration: HKEY_CURRENT_USER\Software\Martin Prikryl\WinSCP 2\
Local account: slawek\slawo
Working directory: E:\Menu
Process ID: 34776
Command-line: "E:\Menu\WinSCP000.exe" 
Time zone: Current: GMT+1, Standard: GMT+1 (Środkowoeuropejski czas stand.), DST: GMT+2 (Środkowoeuropejski czas letni), DST Start: 2016-03-27, DST End: 2016-10-30
Login time: 14 styczeń 2016 16:24:57
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Session name: XXXX (Site)
Host name: XXXX (Port: XXXX)
User name: XXXX (Password: Yes, Key file: Yes)
Tunnel: No
Transfer Protocol: SFTP
Ping type: -, Ping interval: 30 sec; Timeout: 15 sec
Proxy: none
Send buffer: 262144
SSH protocol version: 2 only; Compression: Yes
Bypass authentication: No
Try agent: No; Agent forwarding: Yes; TIS/CryptoCard: No; KI: Yes; GSSAPI: No
Ciphers: aes,blowfish,3des,WARN,arcfour,des; Ssh2DES: No
SSH Bugs: A,A,A,A,A,A,A,A,A,A
Simple channel: Yes
Return code variable: Autodetect; Lookup user groups: A
Shell: default
EOL: 0, UTF: 2
Clear aliases: Yes, Unset nat.vars: Yes, Resolve symlinks: Yes
LS: ls -la, Ign LS warn: Yes, Scp1 Comp: No
Local directory: Y:\, Remote directory: XXXXXXXXXXX, Update: Yes, Cache: Yes
Cache directory changes: Yes, Permanent: Yes
DST mode: 0; Timezone offset: 0h 0m
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Looking up host XXXX
Connecting to XXXX port XXX
We claim version: SSH-2.0-WinSCP_release_5.5.2
Server version: SSH-2.0-OpenSSH_7.1
Using SSH protocol version 2
Server supports delayed compression; will try this later
Using Diffie-Hellman with standard group "group14"
Doing Diffie-Hellman key exchange with hash SHA-1
Verifying host key rsa2 XXXXXXXXXXXXXXXXXXXXXXXX
Host key matches cached key
Host key fingerprint is:
ssh-rsa 2048 62:fc:c8:24:6f:9b:93:3b:ca:81:d9:62:cb:7e:77:d4
Initialised AES-256 SDCTR client->server encryption
Initialised HMAC-SHA-256 client->server MAC algorithm
Initialised AES-256 SDCTR server->client encryption
Initialised HMAC-SHA-256 server->client MAC algorithm
Reading private key file "XXXXXprivate.ppk"
Using username "XXXXXX".
Offered public key
Offer of public key accepted
Authenticating with public key "XXXX@o2.pl"
Prompt (3, SSH key passphrase, , Passphrase for key "XXXX@o2.pl": )
Using remembered password.    <-------- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Sent public key signature
Access granted
Initiating key re-exchange (enabling delayed compression)
Opening session as main channel
Using Diffie-Hellman with standard group "group14"
Doing Diffie-Hellman key exchange with hash SHA-1
Initialised AES-256 SDCTR client->server encryption
Initialised HMAC-SHA-256 client->server MAC algorithm
Initialised zlib (RFC1950) compression
Initialised AES-256 SDCTR server->client encryption
Initialised HMAC-SHA-256 server->client MAC algorithm
Initialised zlib (RFC1950) decompression
Opened main channel
Started a shell/command

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WinSCP Version 5.8 beta (Build 6030) (OS 6.1.7601 Service Pack 1 - Windows 7 Professional)
Configuration: HKCU\Software\Martin Prikryl\WinSCP 2\
Log level: Normal, Logging passwords
Local account: slawek\slawo
Working directory: E:\Menu
Process ID: 21724
Command-line: "E:\Menu\WinSCP-8b.exe" 
Time zone: Current: GMT+1, Standard: GMT+1 (Środkowoeuropejski czas stand.), DST: GMT+2 (Środkowoeuropejski czas letni), DST Start: 2016-03-27, DST End: 2016-10-30
Login time: 14 styczeń 2016 16:22:39
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Session name: XXXX (Modified site)
Host name: XXXX (Port: XXXX)
User name: ads (Password: XXXX, Key file: C:\Beano\new-key\private.ppk)
Tunnel: No
Transfer Protocol: SFTP
Ping type: Off, Ping interval: 30 sec; Timeout: 15 sec
Disable Nagle: No
Proxy: None
Send buffer: 262144
SSH protocol version: 2 only; Compression: Yes
Bypass authentication: No
Try agent: No; Agent forwarding: Yes; TIS/CryptoCard: No; KI: Yes; GSSAPI: No
Ciphers: aes,blowfish,3des,WARN,arcfour,des; Ssh2DES: No
KEX: dh-group1-sha1,dh-group14-sha1,dh-gex-sha1,rsa,WARN
SSH Bugs: Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto
Simple channel: Yes
Return code variable: Autodetect; Lookup user groups: Auto
Shell: default
EOL: LF, UTF: Auto
Clear aliases: Yes, Unset nat.vars: Yes, Resolve symlinks: Yes
LS: ls -la, Ign LS warn: Yes, Scp1 Comp: No
SFTP Bugs: Auto,Auto
SFTP Server: default
Local directory: Y:\, Remote directory: /home/ads/adserver.adsbackend.com/htdocs, Update: Yes, Cache: Yes
Cache directory changes: Yes, Permanent: Yes
Recycle bin: Delete to: No, Overwritten to: No, Bin path: 
DST mode: Win
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Looking up host XXXX
Connecting to XXXX port XXXX
We claim version: SSH-2.0-WinSCP_release_5.8
Server version: SSH-2.0-OpenSSH_7.1
We believe remote version has SSH-2 channel request bug
Using SSH protocol version 2
Server supports delayed compression; will try this later
Using Diffie-Hellman with standard group "group14"
Doing Diffie-Hellman key exchange with hash SHA-1
Host key fingerprint is:
ssh-rsa 2048 XXXXXXXXXX
Verifying host key rsa2 XXXXXXXXXXXXX
Host key matches cached key
Initialised AES-256 SDCTR client->server encryption
Initialised HMAC-SHA-256 client->server MAC algorithm
Initialised AES-256 SDCTR server->client encryption
Initialised HMAC-SHA-256 server->client MAC algorithm
Reading private key file XXXX\private.ppk"
Using username "XXXX".
Offered public key
Offer of public key accepted
Authenticating with public key "xxxx@o2.pl"
Prompt (passphrase, "SSH key passphrase", <no instructions>, "Passphrase for key "xxxx@o2.pl": ")  <------ PROMPT IS DISPLAYED
Response: "XXXX"                                 <------ PASSWORD XXXX ENTERED MANUALLY
Sent public key signature
Access granted