|Message: Re: Interface problem regarding EndOfRunAction display||Not Logged In (login)|
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Sorry to be so long responding to your problem. It got buried in my in tray.
Looking at your source code in EndOfRunAction, the reason is plain - G4endl is missing. This means output remains in the buffer.
The reason "/vis/scene/endOfEventAction accumulate" works for you is that it causes extra printing which flushes your printing.
This is not just a Geant4 problem. For example, if a program crashes you can lose output written before the crash. Always use std::endl or, within Geant4, G4endl, to flush the output buffer. (G4cout and G4endl are equivalent to std::cout and std::endl for terminal sessions but they intercept and re-direct output to the graphical user interface, such as G4UIQt, if used.)
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