Weird. Can I make a suggestion and you make an image backup of current image and a settings backup on your Solo2 and do a fresh usb flash (with no restore of settings - at least just yet) then FTP a fresh download of this plugin to your tmp folder and from telnet type:
and once plugin installed, and full reboot of box (telnet command "init 6").Code:opkg update opkg install /tmp/*.ipk
See if that works which I hope it does. You could then re-install your plugins from feeds again and restore your settings (if that's your preference).