This often crashes about 85% of the Time on world gen right around years 5-15. It has crashed like this since 0.34.05

Region 1 built out to 250 years. It's obviously a fluke and could have all kinds of bugs.

It is massively Casted, with Scads of Reactions and Creature Variations.

The error it usually throws out on my Windows Vista Box is:

Problem signature:
Problem Event Name: APPCRASH
Application Name: Dwarf Fortress.exe
Application Version: 0.0.0.0
Application Timestamp: 4f55f23e
Fault Module Name: Dwarf Fortress.exe
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 4f55f23e
Exception Code: c0000005
Exception Offset: 00361d76
OS Version: 6.0.6002.2.2.0.256.1
Locale ID: 1033
Additional Information 1: fd00
Additional Information 2: ea6f5fe8924aaa756324d57f87834160
Additional Information 3: fd00
Additional Information 4: ea6f5fe8924aaa756324d57f87834160


I've tried removing species, civilizations, and reactions all to have it still crash 85% of the time. Usually at worst my error log only complains of Impoverised Word Selectors.

There is some other issue with the Fallen [entity_fallen.txt] and the Seputus [entity_cultist.txt] that causes slowdowns during world gen civilization placement. It should be completely unrelated as worlds have completed with both civilizations intact. Removing their entity files gets around the bottleneck.

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The Crash relates to creature_deadly_wambler.txt having SEMIMEGABEAST and BIOME:ANY_LAND
These will crash DF with the above violation. The temp fix is to give them a different BIOME, Remove SEMIMEGABEAST, give them a LAIR (not always 100% effective), or give them POWER and some appropriate SPHEREs.

As this is semi resolved -certainly doesn't need 26mb of space to replicate a smaller than 4k example- in a few days I will remove the file from the repository.