Hi Chris,
I'm trying to run the tests for 1.4 in Squeak and I'm getting a failure in tryChangingIndex50 I'm using Squeak 4.4 with a recent Cog VM on Linux, and I loaded Magma 1.4 from Squeak Map.
The actual failure is Assertion Failed in the final assertion of tryChangingIndex50:
self should: [ err result commitConflicts first conflictingObjects anySatisfy: [ : each | each key = ma yourself ] ].
I'm assuming the tests pass for you? What VM and OS combination have you tried?
Regards, Stuart