Okay Guys!
There are many posts on the freeze issue and it seems that it is only on certain maps.

Some maps are stable and some are not.
Someone posted a list with stable maps, so you can do a search if you want to play without game freeze . or just experiment and eliminate the ones that are unstable.

After all .. We only paid $50 for an expansion pack .. What do you expect for $50!! A Real Game?????

We already have a limited number of maps .. it really sucks that Ubisoft can't even make all their maps stable and have seriously cut the number of maps we have in Vegas 2!!

I honestly don't think they will ever fix this or the lag when some enemies appear occasionally. These two things and probably the odd sound issues that only happen in this game, are what kill it totally. After all the time that's past since release, you'd think this would have been a priority to fix asap but they didn't do it. The only good thing about this game is cracking open the textures to use on UT3 maps.

As someone posted before (and I can confirm), the following maps are OK (no host crash at the summary screen).

Train
Theatre
Con. Centre
Oil
Three
Kill House
Street
Pres


Can't play Villa, CQB, Murdertown, Import, Comcast (so much for the bonus map -.-)

I think those are the same maps I found okay too. Also this sound issue where you can't hear them coming up is annoying. I have zero sound issues in any other games I play which is QUITE a lot. I tried all the community suggested fixes and nothing works. I base my skills in fps off 50% of what I hear. So this really sucks. I wish ubi would stop jerking us around and wasting time and fix this crash, fix the sound, fix the damn streaming textures lag and get this game solid. it could be so good but because of these issues and the debatable spawning enemies, it not a good experience at all. Leveling up past Major seems way too slow too but that's just because I have a life and don't want to waste it in Vegas 2 all the time earning armor and camo I had in the first one out of the box (pc).

Ubisoft is going to fix all of these issues in Vegas 3 .. 4 .. 5 .. or Maybe Vegas 6!!!

I don't think they care about fixing anything or stopping customers from walking. Ubi's track record in regard to support won't hurt this game though, because it's already in tatters from the constant bugs and crashing and pay to beta test format it was released as. After almost a month, the problems still exist.