All

> x := SequenceableCollection new, then try to print x. Lock-up + 100%
> CPU. The only response is from the main window, quit without saving then 
> kill squeak as it's still running.

Thank you to everyone for the discussion and the tips. I enjoyed reading it.
I now save my image much more frequently. Things like this become much less
of an issue once they are understood. In my defense I would say that I
didn't read the comments for the class, my fault. However, apart from the
comment I am at a loss to understand what makes this class abstract, there
is no special protocol in the class definition and all the methods appear to
have an implementation. I was expecting to find subclassResponsibility
somewhere like it says in http://minnow.cc.gatech.edu/squeak/472. 

> I was simply trying to understand why forceTo: paddingStartWith: 
> didn't work if the length was more than the original string.

On this point which I think got masked by the first point. I have now
discovered that '0' is not the same as $0. Saying paddingStartWith: '0'
gives an indexing error. Probably blindingly obvious to anyone who has
worked with Smalltalk for a while. 

Regards
Bob

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