What is the AMD card issue?

[DMPlayin]

What the title says really. What is the AMD card issue mentioned on most posts in the bug reporting thread?

 

[SylenThunder]

Random world generation making combed terrain. It's listed in the patch notes. Mostly fixed in the b149 update.

 

[DMPlayin]

Random world generation making combed terrain. It's listed in the patch notes. Mostly fixed in the b149 update.

Thanks. I guess I need to submit a bug report for something else then.