My mweb is 100% fine for vpn/ssl, watcha talking about? I do tons of work over VPN, to many sites around the world.
Can I ask what VPN you use?
I use openvpn (udp port 1143) but the speed via mweb is horrid. I get better speed by running the openvpn server on port 443/TCP and fooling mweb's system into thinking its an https page, but that sort of hack is just a bad idea long term.