ID:1948376
 
Resolved
Using animate() with icon_state or other text values could cause a crash.
BYOND Version:509.1301
Operating System:Windows 7 Ultimate 64-bit
Web Browser:Chrome 45.0.2454.99
Applies to:Dream Seeker
Status: Resolved (509.1302)

This issue has been resolved.
Demo: http://files.byondhome.com/Kamuna/TestCases/ TestCaseImageAnimateAndClientColor_src.zip

As you can see from this demo, the icon_state when using animate() on a group of images is not updating properly in version 509.1301, but they are working properly in 508.1299. This one doesn't cause a crash, which leads me to believe some kind of undefined behavior is happening, because in my bigger project, it does cause a crash.
Lummox JR resolved issue with message:
Using animate() with icon_state or other text values could cause a crash.