Here's the thing:
Can addon meshes or parts of weapons (shotguns, rifles, etc.) be transparent, or does it cause a CTD? 'Cause I've got a bit of that in a map and it crashes without anything in the debug log that looks strange. The only strange thing about the debug log, in fact, is how short it is. So is it possible to have transparent addon meshes/weapons?

Why don't you debug it yourself?

Create a new "test" map
Munge and play to make sure the map works
Create a new side with one unit
Munge and play to make sure the side works
Insert addon msh with transparency enabled into your new side
Munge and play to make sure the side works
Insert weapon with transparency enabled into your new side
Munge and play to make sure the side works

If the map crashes after any of these steps then you'll get your answer.

Tip: Anything you're unsure of should be tested in a similar fashion.

The problem mainly being that the new map I'm talking about was a test map. Still, I'll run it through again with a few more blank maps and see if that changes anything.

I remember I made the rocket launcher barrel part of Syth's DTL-19 transparent and and no crash occurred.

Are you sure? I'm having the trouble with this over and over again, and despite killing of numerous test maps I haven't found anything suspicious.

Yep, I even released the map (Tak Base).

Did you do some special Pandemic Tools thing, or did you hex-edit the transparency in? I hex-edited dual-side transparency into my weapon.