NMM has now been hotfixed to 0.15.8 to resolve further crashing issues.
Nexus Mod Manager version 0.15.7 has just gone live on the release server and should be available when you start NMM (if you can start NMM) or from the download page for NMM
. This is a hotfix patch to resolve the issues that 0.15.0 presented.
A big thanks to kaburke and wrinklyninja who have worked on a Saturday to get this out for us.
In regards to version 0.15.x of NMM it's important to note that while NMM is now using BOSS API to manage load orders NMM does not currently use BOSS's auto-sorting functionality. That means that your load order is still completely managed by you. Priority with this release has been to just make sure the load order functionality is restored after Bethesda and Valve changed it to accommodate Steam Workshop. NMM does ask you if you want to download the latest BOSS masterlist, but at the moment this will not have any effect on your load order. It will be patched in soon (you are safe to pick yes or no).
If you are unfamiliar with BOSS then it would be a good idea to read up on what it does on the BOSS file page
here on the Nexus. Here's some of the blurb:
BOSS (Better Oblivion Sorting Software) will re-order your mods to their correct positions, putting any mods it doesn't recognise after them, in the same order as they were before BOSS was run.
BOSS is designed to assist in the usage of mods, helping mod users avoid serious conflicts. It is not a complete solution to load ordering issues, as there are far more mods out there than BOSS knows about. To properly place mods BOSS doesn't know about, a good working knowledge of mod load ordering for Skyrim is still necessary, for which some research and documentation reading will go a long way.
Once NMM is fully integrated with BOSS you will be able to use the BOSS masterlist, which tries to come up with the best load order for your mods automatically. You can still manually manage your load order, and you can use BOSS's autosort feature to see what BOSS thinks is the best order then edit that order to your heart's content.
At the end of the day it's about providing you with as much help, and flexible choice, as possible.