Has anyone got any insight as to why the asicminercharts website say that asicminer hasnt mined any new coins since about 4 hours ago?
Because they didn't find a block from 6/24/2013 20:24:36 UTC until 6/25/2013 0:17:34 UTC.
humantime blockhash blockheight difficulty
6/24/2013 20:24:36 000000000000007a3d7ccff09fbe0bb6eff6ff1081b258d60301c0b746cc2985 243145 19339258.2723867
6/25/2013 0:17:34 00000000000000361dc567c2cbba2347a4678461efd9d28f409e4e9d84ebc5bb 243172 19339258.2723867