Just rebuilt the whole thing from scratch again. The image was in a certain state, where all the registered Seaside components were lost and the default Pier style was lost as well. Probably due to reloading various versions of Squeak.

So I loaded SIXX, exported yesterdays work and did the rebuild. Then loaded the saved work again and started this scribble. Had to restart the Pier image first, because it had troubles opening the transactions.txt from the image persistency. First I thought it had something to do with the OS/2 Squeak VM having problems with file i/o, but a simple image restart did the trick.