[Solokiller]

Looks like the problem is that when a sprite is loaded, its cache data is set to the msprite_t pointer but the cache system expects there to be a cache_system_t right in front of it in memory. It treats whatever's in front of it as such and ends up treating random data as a pointer to the LRU linked list.

I've reported it with all required information here: https://github.com/ValveSoftware/halflife/issues/2085

Apparently it's been a known issue for almost 6 years: https://github.com/ValveSoftware/halflife/issues/72