hotspot bug in XEON?

The routeros installed in a machine PROLIANT HP DL320 G5P XEON 3075 DUAL CORE 2.66GHZ with 1GB of RAM and 4 plates HP NC110T PCI EXPRESS GIGABIT, set the LAN and WAN interfaces, I made a masquerade, everything worked okay so far managed to navigate on the Internet normally, but when the hotspot configure the login page does not appear on the customer, when you put the same HD with the same settings on another machine common operating normally, someone knows how to fix this problem?

I installed the version 3.1 for testing and to my surprise functioned normally, but had tested the version 3.10 and 3.11 and the two had the same problem, but I would use the latest version, as the CPU 3.1 acknowledged as having only 1 core , While the 3.11 acknowledged everything right.