I am having the following problem:
-Firing an arrow (any arrow, not just the special ones) causes a hard crash that forces a restart of the computer. Happened on both normal and enchanted bow.
-Changing load order (http://www.tesnexus.com/downloads/file.php?id=20516) initially fixed this, however then I had a hard crash whenever using a Telekinesis spell
-Added a few more mods, ran BOSS again, and now we're back to having firing an arrow crash my PC. So I just took it out and everything works as it should again.
Note: My game does like to crash more often than it should, but these are normal crashes that don't force a restart of the PC, so it is a different type of crash.
Removing Thieve's Arsenal.esp at each point in this process fixed the crash and allowed Telekinesis to work again as well as fire arrows as normal. Using tes4edit and looking for conflicts, there were a number under the "Light" category with the unofficial oblivion patch, as well as one entry under Magic for projectile speed (Supreme Magicka changed it from vanilla but it was put back to 1 which is default by Thieve's Arsenal). I have tried putting it last in load order to no avail.