Got the following error in v3.1
=====================
2014-06-12 00:51:37.328] [30, 73, -80, -21, 78, 47, 31, 121, 29, 38, -102, 63, -49, -8, 92, -57, -98, -50, -121, -94, -16, 105, -14, -28, -34, 55, 115, -25, 28, 74, 125, -116]
[2014-06-12 00:51:37.328] Checksum NQT_BLOCK failed at block 30000
[2014-06-12 00:51:37.328] Checksum failed
[2014-06-12 00:51:38.470] [30, 73, -80, -21, 78, 47, 31, 121, 29, 38, -102, 63, -49, -8, 92, -57, -98, -50, -121, -94, -16, 105, -14, -28, -34, 55, 115, -25, 28, 74, 125, -116]
[2014-06-12 00:51:38.470] Checksum NQT_BLOCK failed at block 30000
[2014-06-12 00:51:38.470] Checksum failed
[2014-06-12 00:51:39.607] [30, 73, -80, -21, 78, 47, 31, 121, 29, 38, -102, 63, -49, -8, 92, -57, -98, -50, -121, -94, -16, 105, -14, -28, -34, 55, 115, -25, 28, 74, 125, -116]
[2014-06-12 00:51:39.607] Checksum NQT_BLOCK failed at block 30000
Did you update the software?