I have T1 line 1.5Mbs down/up.
Without UT box everything goes smoothly , the problems starts when the UT is added to the mix.
We used to use Fortinet another WEB filtering solution and we did not had those issues, that box runs a risk 600Mhz processor go figure.
I think something gets missed by UT team is see that the success is 50/50 50% gets it working 50% does not.