Two particular levels crashing on rebirth 0.61

[TRUEpiiiicness]

So I decided to recap and look at the balancing of the levels in Descent: The countdown.
I went in ascending order, analyzing robot appearances and formations, playtesting as well.

However, when I hit level 17 the game crashed when it was loading the level. 'Prepare for descent' appears, then the game closes with no error message, no warning no nothing.
The same thing happens with level 18 as well. I am absolutely clueless when it comes to solutions. They have no errors, the music is set up correctly, the .mn2 is good and they are below the cube limit.
They were also working properly on version 0.59.1 which is what I upgraded from.

Is there some sort of log or dump file that could be opened to see what may have happened?

If anyone wants the two levels to see what's up I'll send them via PM because of spoilers.

[LightWolf]

I might be able to take a look.

[TRUEpiiiicness]

I've sent a PM. All I can say is good luck.

[TRUEpiiiicness]

So I've finally got around to finding a fix (not really a fix, but more of a workaround) for level 17, which was to swap out all vertigo bots and convert the level to descent 2 from vertigo.
Unfortunately that doesn't work for level 18 so that's still broken.

[Arne]

It's related to the number of different textures in the level, the robots, etc. Somehow this is a number that hits an old bug in the OpenGL code (not sure why it works in 0.58.1).

I've submitted a patch for rebirth.

[TRUEpiiiicness]

Wow I didn't expect it to be that far deep, that's a huge weight off my shoulders. Thanks for the help.