Aaahhh now I see.
I was expecting the proxypass directives to be inserted into the config file but be commented out if they were syntax erroring out. I read this somewhere, but it is not so.
So if syntax errors are generated then the Vhosts file is created with the date and time instead.
You are right I tried putting the proxypass directives in again and it worked this time.
The real issue I was having that was causing the proxypass problem was not having both mod_proxy and mod_proxy_http enabled.
It seems like most of the howto guides I was looking at leave out the mod_proxy_http part.
Its working now, and I love this ISPConfig. I'm not an ISP and am probably only going to host a handfull of virtual sites on this host, but it seems to me this ISPConfig tool is going to make managing this webserver a lot easier.