Letters of Recommendation when applying afresh to a new PhD program I'm currently enrolled in a PhD program in the US. Before picking up my master's degree, I'll be applying to a different PhD program that's more suited to my interests. I will be able to get two letters of recommendations from my undergraduate university and one letter of recommendation from my current graduate institution. Does this combination seem all right? If possible, I can get a second letter from my current graduate intuition as well, but I suspect that letter won't be very strong due to my not having done a lot of work with that faculty member.

Does this combination look all right?
(Again, for the U.S., especially in mathematics, my field...) Generally, the more recent the basis for letters, the better, by far. For that matter, having 2/3 of your letters be pre-graduate program might make admissions committees wonder what happened in your graduate work.

If you can get an absolutely stellar letter from undergrad, that might be helpful, but also really try to find two solid letters from your graduate program, attesting to your capacity for graduate work, rather than just saying you aced undergrad material.