Ok,

I started with a fresh image (Squeak3.10.2-Trunk-091128.zip) and
updated. Then I reinstalled some packages (FFI, OSProcess, OSProcessIO,
CommandShell, Balloon3D) and the problem disapeared.

Last image had installed VMMaker, Speech and other packages. I'll try to
reinstall everything in order to see where the problem arises).

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