Ok first off I like to do the good glitch where you buy all the stuff from a trader and win your money back by playing Caravan.
Well anyways I was doing Caravan Card glitch with Lacey at the Mojave Outpost to make some money but after I won a couple of crad games she wouldn't play Caravan anymore.
So I thought that I had to wait a couple ofdays before I could play Caravan with her again. So I went to Novac to win money from Cliff Briscoe
but when I talked to him I did not have the option to play Caravan. I even started multiple games to see if it would happen again and everytime it did do it again.
Sometimes it would happen right off the bat when I talk to them and sometimes it takes 3 - 4 hours of gameplay before it happens and
when the glitch happens it's permanent. Plus this bug didn't start doing this until after the I downloaded the newest patch.

Oh an another glitch I have is the one where your guy holds a gun over his head or below by his knees.

The last glitch I have was the one where your guy won't fire in VATS.

I am also experiencing this bug post patch, among many, many others. This game is a bug ridden hunk of rubbish. Shame on you Bethesda for letting it be released in the state it's in, and as for Obsidian, please, just stop making games, you must know you are utterly terrible at it. How could you not after all the games you have ruined?

The thing with traders that stop playing caravan is intentional and was added in the last patch. Probably to stop people making absolute tonnes of money from them.

I have also experienced Caravan refusal on the part of the traders, which began with Lacey at Mojave Outpost. At first I kind of laughed, given that I'm 47/1 or 48/1 (could be 50, wasn't paying close enough attention to it) & have won tens of thousands of caps with Caravan. I figured she had had enough of my superior abilities, so (as also Death Reaper posted) I went to see Cliff Briscoe in Novac, where I learned that he also refuses Caravan. To my chagrin, Johnson Nash in Primm also blew me off. Rather unfortunate, I thought, given that I have 2 caps in my pocket and was given no warning whatsoever of such a "house-limit" which applies to the game in general. Can someone please verify Caravan restrictions having been included in the last patch? Lacey keeps greeting me with "That last hand, that's just my luck" so it seems like a bug from that angle, although its absence from the dialog tree in general makes it seem like a game-wide limit restriction. And if it is a game-wide restriction, I wish it had been handled a bit more deftly...like maybe giving the trader AIs more intelligence in playing the game in first place? None of the traders ever played a Jack against me, which is the surest way to keep the opponent at a disadvantage in the game. The issue could have been handled from several different angles, rather than simply evaporating the option from the dialog tree, leaving the player to wonder if it is simply another one of the glitches to be endured in the game.

Regarding the triple 26s, I've seen that happen a couple of times. Even if one of the contracts is tied at 26, shouldn't the win then be decided by the other two contracts? I've had triple 26s against an opponent without a tie and had to discard (looking for a Jack) until the deck ran out before the game was decided, but that doesn't seem right.

It's not a bug. It is an intentional feature of the last patch.

Apparently you can only play caravan up to 5 times with each trader. There is no play limit with the non traders through.

Although caravan does seem buggy since last patch. There are many times when I've had 26 in all three hands and the game doesn't register the win. Either the game is now bugged or I still don't fully understand the rules of caravan.

I'm having the same happen to me. I have all my decks at 26 and its not acknowledging I've won the game and so the game just continues. This is preventing me from getting the Caravan Master achievement. If this is a bug you would think it would have been fixed by now considering all the patches that have come out.