That looks like Deamia (Selenicereus) testudo - same sort of tropical vining cactus but doesn't produce (IMO) as desirable a fruit. I don't know the specific problems you're having, but they're usually traced back to undesirable soil - as long as what you've repotted it in is porous, and the plant remains solid, I wouldn't worry about it. Some corking, particularly on the base on older plants, is normal and should be expected.

I'll try to find a pic of my uncles short fruiting DF. I'll also test it with one of my one cuttings and let everyone know how it goes. My uncle topped his plants in a pot when they were about 4ft tall and he also cut the side branches when they were about a foot or so. He had to prune occasionally to control for size and shape. Now looking at the picture I posted, I'm pretty sure that the plants were grown in the typical fashion (Full Sized) and then the fruiting branches were cut and stuck into pots. If they were grown in the pots and fruited in those pots, I would expect a lot more side branching like I see on my uncles potted DF.

I'm looking for some cuttings from the purple haze variety or similar type. Can someone help? I have trumpet vine seeds to trade. I'm willing to buy if not to expencive. Grandpa Steve

Greenman62, Thank you for responding. I used Miracle Grow potting mix, but recently moved it the Miracle Grow garden mix. Not sure if there's a major difference. I water it throughly & let dry out between waterings. I read lots of warning on overwatering so I try to avoid it myself. Louisiana is nice, but got some cold front here & there the beginning of spring. Sometimes it got down to maybe 40s - 50s F. No frost though. Could that be the reason?