Is your 'EXCEPTION_VIOLATION' from the server or client?
One of the dev's pushed a cap for UF material/idfile values recently:
https://github.com/EQEmu/Server/comm...ffff990f75b8ad
It's not too far-fetched an idea that item numbers could be (probably are) limited as well.
Code:
int x[100];
x[99] = 0; // ok
x[100] = 0; // EXCEPTION_VIOLATION