[solved] Hotspot driving me crazy

I am living a in nightmare since we changed our internet gateway
Until yesterday, the gateway was a RB532 whose ethernet went in to an adsl router, the central hotspot for user auth was the 192.168.253.254 and the hotspot we installed on it a few moths ago was working flawless..
BUT (there is always a but, isn’t it?)
Yesterday we succeded in setting up the link with a carrier wich is providing us access to a NAP in Italy through their hiperlan backbone. Great! They are even using RBs on their side! They are RB consultants!!!
I exported the settings from the previous gateway (all profiles, walled garden sites, users, mangles, queus for p2p etc.), I imported them on the new gateway on a RB 112 with the Hostpot module enabled, I switched the routes to go on the correct gateway (192.168.253.137 now), I tested the internet connection before enabling the new hotspot, everithing went smoothly until I enabled the new hotspot.
The hotspot works very well, in facts it blocks the access to the internet… but it never shows the login page and no one can log on! It just gives the annoying “cannot find server” page for each internet address…
Can you please help me in getting things right?
For now, I just disabled the hotspot, otherwise the customers would have killed me..
What happened? The setups are identical, except of course for the different ip addresses.
I am really going crazy…

It was just the wrong interface…
Now the hotspot is on the right one and it works perfectly