If this should be anything similar to a bug report you should post WAY more information.

You have to use "Normal" core. It wont' crash then, but overall performance may be lower, depending on how good your system is, and how good tweaked Dosbox is otherwise.

And if you read the bit about using dos32a instead of dos4gw - ignore that, that is only valid for older versions of Dosbox. Dos32a + A final Unity will make for extreme instability, no matter what on current Dosbox versions.

Gee, I wasn't aware that DOS32a could ever make things worse. Does that warning apply to other games as well?

In general you should stick to the game's default extender, if something
does not work try dos32a or some different dos4gw version (2.01 especially).

Hmm, I don't have those many games to compare, but Terra Nova e.g. should run better with dos32a (I haven't tried that for a few versions though, so it may be broken now aswell with dos32a, but I'm not sure).

I haven't tried that for a few versions though

Well then.