I believe I'm experiencing some kind of stability problem with v1.4 Build 5532 Standard Edition.
The symptoms are that a very large number of Handles (16M and 31M on two separate runs) are created over time and my machine pretty much comes to a halt. By coming to a halt I mean unresponsive to mouse or keyboard.
Only one of the 36 available cores (core 2) is doing anything, it is at 100%. all other cores are essentially idle.
It's an Intel i9 with 128Gb memory and twin EVGA GTX 1080 Ti SC Gaming 11 GPUs.
This happens many hours (10+) into the photo alignment stage of processing a 7200+ camera model.
On one occasion while running the above mentioned big model I got impatient and started up a 2nd copy of Photoscan to build a mesh using the new algorithm on a model that I had originally aligned using version 1.3.4. It was a smaller model (3200 cameras). I noted during this run that again only core 2 was at 100%. It got to a stage with 16,000,000+ handles that neither copy of Photoscan seem to be making any progress. I tried pausing one then the other but neither paused or made any progress (no output to the console). When the copy of Photoscan that had been running for 12+ hours was killed the handles reduced to 15,000 or so proving it was the long running copy of Photoscan that appears to be leaking Handles.
PS: Memory usage is fairly low (<25% of 128GB).
HTH