If ur timer doesn't work then lock the account and unlock again. Repeat this each 5 minutes until ur node successfully pushes the generated block.
Did the trick with no luck yet..
[2013-12-02 16:03:36.833] Nxt 0.3.0 started.
[2013-12-02 16:03:36.846] Loading transactions...
[2013-12-02 16:03:36.881] Loading peers...
[2013-12-02 16:03:37.040] Loading blocks...
[2013-12-02 16:03:37.049] Loading accounts...
[2013-12-02 16:03:37.062] Loading assets...
[2013-12-02 16:03:37.063] Loading orders...
[2013-12-02 16:04:30.806] 9/21: java.util.ConcurrentModificationException