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RTA printf logs do not refresh until execution is paused

Code Composer Studio Version: 5.5.0.00077
DSP/BIOS 5.42.1.09
XDCtools 3.25.3.72
XDS100v2 emulator. C5535 target.

I have a quite simple DSP/BIOS application running on a C55 DSP. The application seems to work OK. A push button generates an interrupt on a GPIO pin. GPIO Interrupt service routine sets a variable. Another task enters into an infinite loop where it is checking the value of the variable, when button is pushed, variable changes, a message is written with LOG_printf, variable is set back to 0 and TSK sleep function is called for 100ms using PAL_osWaitMsec(100).
Everything seems to work OK except that LOG printf messages do not display in real time, they only appear when execution is stopped. Even initial LOG_printf messages only appear after execution is paused.
Execution is most of the time running IDL_busyObj. 
CPU Load is 1%.

What's wrong? How can I see RTA printf log messages refresh in real time?