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There have been two variations on this: 1) Users remote shell initialization emits some error, like "/bin/arch: not found" dbx's connection fails with a "timed out" message. This was "fixed" by making dbx startup not go via a shell wrapper (see ExecutorUnix), but then ... 2) Similar error messages but this time originating from .dbxrc. In this case the GUI hangs!
dbxgui has an "algorithm" to detect that it's talking to an older dbx (from pre master/slave) days that depends on detecting error messages from dbx. These additional messages confuse the algorithm.