Hello, are these problems known? I am using the latest RC build. * Create changeset X. Touch method Foo>>bar. Create changeset Y. Touch method Foo>>bar again. Fileout changeset X. The fileout has the code for changeset Y. * Delete the first ! in a changeset with a preamble. Try to load it from the file tool. You get a syntax error. However, the progress bar does not go away. Is the file handle released? * Integer>>isPrime should not be probabilistic. Suggestion: rename it to Integer>>isMostLikelyPrime or something similar. Implement a deterministic prime check for isPrime (even if it is slow --- users then can decide whether they want a deterministic or probabilistic answer). Here's a rough sketch of Integer>>isPrime: isPrime | guess guessSquared delta selfSqrtFloor | self <= 1 ifTrue: [^self error: 'operation undefined']. self even ifTrue: [^self = 2]. guess := 1 bitShift: self highBit + 1 // 2. [ guessSquared := guess * guess. delta := guessSquared - self // (guess bitShift: 1). delta = 0 ] whileFalse: [guess := guess - delta]. guessSquared = self ifFalse: [guess := guess - 1]. selfSqrtFloor := guess. 3 to: selfSqrtFloor by: 2 do: [:each | self \\ each = 0 ifTrue: [^false]]. ^true Also, the above code can be used to implement sqrtFloor and sqrtRounded in Integer. I am sure Nicolas Cellier remembers this :). Finally, I'm not sure that isPrime should fail with "undefined operation" if the receiver is <= 1. 1 is certainly not prime. Primes must be positive, so zero and the negatives could just answer false. ???... * Open an inspector on e.g.: Smalltalk. In the code pane, type: self keys inject: Set new into: [:t :x | t add: x class; yourself] Using the mouse, select the expression, and inspect the result using the right button menu item. The result comes up. However, the inspector on Smalltalk experiences a failure in one of its panes because lines is nil in MultiNewParagraph(NewParagraph)>>fastFindFirstLineSuchThat: Andres.