This is what happens when I load blockland:

It has been happening for 3 days in a row and I don't know how to fix it, any ideas?
Also, I have an issue when I start my computer up. My blockland asks me for my key, and I have to go to my email and get it.
Here's my specs:
Machine name: KEITHSCOMPUTER
Operating System: Windows 8 64-bit (6.2, Build 9200) (9200.win8_gdr.121119-1606)
Language: English (Regional Setting: English)
System Manufacturer: ASUSTeK Computer INC.
System Model: CM6330_CM6630_CM6730_CM6830-8
BIOS: 0402
Processor: Intel(R) Core(TM) i5-3350P CPU @ 3.10GHz (4 CPUs), ~3.1GHz
Memory: 6144MB RAM
Available OS Memory: 6098MB RAM
Page File: 2695MB used, 5011MB available
Windows Dir: C:\Windows
Here's my video card specs:
Card name: AMD Radeon HD 7470 Series
Manufacturer: Advanced Micro Devices, Inc.
Chip type: AMD Radeon Graphics Processor (0x6760)
DAC type: Internal DAC(400MHz)
Device Type: Full Device
Device Key: Enum\PCI\VEN_1002&DEV_6760&SUBSYS_85151043&REV_00
Display Memory: 3803 MB
Dedicated Memory: 1010 MB
Shared Memory: 2792 MB
Current Mode: 1024 x 768 (32 bit) (60Hz)
Monitor Name: Generic Non-PnP Monitor
Help would be VERY gladly accepted. Also, I am kind of new, so no negative comments please. :)