Hi, There are two changesets waiting for integrating in 1.4 that have serious consequences: - Ephemerons. The VM level changes are in the Cog VMs build on Jenkins, but have not been integrated in the VMMaker codebase. http://code.google.com/p/pharo/issues/detail?id=4265 - Finalization code checks for #hasNewFinalization This is true in the current VMs build in Jenkins, but in older VMs this is not in. http://code.google.com/p/pharo/issues/detail?id=4483 There are two options: a) integrate in b) not integrate it a) means that the image runs on older VMs, too. b) means we accept that we can never improve anything for real. There will be more changes coming... e.g. imagine we have a Vector Graphics Canvas as some point next year... what will we do? use it or not use it to stay compatible? Marcus -- Marcus Denker -- http://marcusdenker.de