Don't know what else to tell you. If you still have a debuggable Qt4 version of the program, you can try stepping through the call to submitAll and see what the differences are, if any. I suspect it might be a difference at the driver level since the Qt code is the same.
You can probably open it read-only, but you are right - it shouldn't matter since PostgreSQL should allow multiple connections.I'm careful to not have the database table open in Base during testing.
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