Dockstar not booting after kenel upgrade

Hello
I have a big Problem since last upgrade.
apt upgraded to linux-image-3.2.0-4-kirkwood:armel 3.2.57-3
and now it seems to me that this kernel doesn´t load
nc says:

## Booting kernel from Legacy Image at 00800000 ...
   Image Name:   Linux-3.2.0-4
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1613672 Bytes = 1.5 MiB
   Load Address: 00008000
   Entry Point:  00008000
   Verifying Checksum ... OK
## Loading init Ramdisk from Legacy Image at 01100000 ...
   Image Name:   initramfs
   Image Type:   ARM Linux RAMDisk Image (gzip compressed)
   Data Size:    7511283 Bytes = 7.2 MiB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...

In my Router overview dockstar shows up with correct IP (manually set in /etc/network/interfaces)
but pinging it is not possible and after a little while it disappears in Router overview.
In the dmesg file on the usbstick last successfull boot shows logs from kernel 3.2.41, so my guess is that the new kernel is not starting.
Maybe anyone has any ideas what to do?
Without usbstick tho original pogoplug is still working so the Hardware seems to be ok.
Thanks