Thanks to new store instruction I am able to create self-encrypting executables. I would like to report on status of encryption using display directive, but it only outputs all buffered text after compilation process is complete. Is it possible to output (in console versions of FASM) instantaneously to screen after display is invoked?

This would give you display messages repeated on each intermediate pass (and with possibly wrong data, as during intermediate passes not all labels are resolved correctly).