OS: Windows 7
Version: 0.0.5 Develop
Commit: 4298f41
Explanation of the issue:
When you try to switch the rolling/banking while building a custom Suspended Swinging Coaster, the game crashes. Upon further inspection, this is not reproducible in RCT2 Vanilla...because Suspended Swinging Coasters cannot be rolled/banked.
The option to do so should not be there in the first place.
Reproducible in RCT2 (vanilla)? No.
Steps to reproduce:
Dump/Save file
This does apply to many more coasters. https://github.com/OpenRCT2/OpenRCT2/commit/aa929e1593e7a2adcc0c5886c2693c3e2ec407fa seems to have caused it. In b5c0913b76facd25f8db03c4f6f7bbd615eb6e76 (parent) the banked button is not displayed for rides that don't have them.
Vertical Loop have the same problem on many coaster, for example Giga Coaster have this track but on RCT2 Giga Coaster does not have this track.
OpenRCT2:

RCT2:

I have noticed that if you try to open a game previously saved in OpenRCT2 the bug is reproducible in RCT2.
RCT2:

The result of this: Crash!
I have also seen this in the original game (though I think later versions fixed this, though I have seen this bug before) where in some circumstances taking the car into a bank at some random point will cause it to crash (this is also caused by the same thing if I'm not mistaken... I've only had this type of rolling/banking crash on the LIM Launched Coaster (especially taken at high speeds) and the Spiral Roller Coaster (which both have that option in the original game)). I suspect this is an original bug that's been aggravated and is caused by an original bug.
There is a sloped banking curve you can try building in the original game but the build button refuses to accept this. I don't remember exactly how to reproduce this
Reproducable on Ubuntu and Arch Linux, both on newest development version as of this moment (3914e92117debc1709b18a2655ae7d44b94a9dcf). At the exact moment you select the banked turn it crashes.