Well well well!
After reading the forum a little I think I know why it took so long to find that block!
Maybe because LTC can be mined with asic now and all asic owners tried it!
Just my 2 satoshies!
They can be mined with ASICs, as could any coin, but not the same ASICs, because of the AS in the abbreviation - Application Specific. Litecoin proof-of-work has not changed so ASIC bitcoin miners can still only be used for bitcoin mining, that is a different task.
You can see those probabilities I posted, it is easily explained by chance that block generation took so long. About one in five hundred blocks take more than an hour so there it is expected even with rising hash rates that there is an event like that almost once a week (block genaration taking more than one hour). 75 minutes is of course significantly longer and more rare but that will happen too.