Radiator 5.3.5 - problems with permissions

Normally i use Firefox 12.0 (on Windows), but now i tried to do same on my with Google Chrome 19.0.1084.52 M and same thing happened. This is how it looks after editing and saving it via web interface:

{
    "alt-speed-down": 500, 
    "alt-speed-enabled": false, 
    "alt-speed-time-begin": 540, 
    "alt-speed-time-day": 127, 
    "alt-speed-time-enabled": false, 
    "alt-speed-time-end": 1020, 
    "alt-speed-up": 30, 
    "bind-address-ipv4": "0.0.0.0", 
    "bind-address-ipv6": "::", 
    "blocklist-enabled": true, 
    "blocklist-url": "http://list.iblocklist.com/?list=bt_level1

EDIT. Looks like i've found what's causing settings.json file corruption. This is the line i enter into settings:

"blocklist-url": "http://list.iblocklist.com/?list=bt_level1&fileformat=p2p&archiveformat=gz",

Now this is how this line looks after saving settings:

"blocklist-url": "http://list.iblocklist.com/?list=bt_level1

Looks like character "&" isn't supported and saving file breaks at this point? If i leave this line empty i can save settings (via web interface) with no problem..