ASSERTION: "fireball_type < Num_fireball_types" at fireballs.cpp:794
Int3(): From c:\code\fs2_open_0\code\globalincs\windebug.cpp at line 963
Thanks for the debug log. It will be a few days before I can take a closer look at the problem. I may have messed up when writing the fireball.tbl. If you happen to have a 3.6.14 debug build on hand, do you get the same error running that too, or is it just the 3.6.15 version?
I'm thinking the Drazi beams are still red because I gave the files for the Drazi beam graphics the same filenames as the vanilla ones, which is a big modding no-no. The vanilla TBP 3.4 stuff is probably overriding the upgrade stuff, which is exactly why I should be using unique filenames.
Oh, if I'm looking at the debug log right, the effects_upgrade.vp is in the core TBP directory? Have you tried moving it to its own folder and loading it as a mod in the Launcher, like Zathras? If not, try that and let me know if the Drazi beams are still red. Don't disable Zathras to do this, just add something like "-mod effects_upgrade" to the command line options, assuming you haven't already.
Argh, so many things I should have mentioned.
These screenshots are 9 days old (I can't take more current ones right now) but I don't think these particular effects have changed since then. If things don't look like this even after loading the effects as a separate mod then I'll have to recheck the tables and the .vp structure.