SoapUI Pro 2.5.0 stucks on first run

I have just updated from 2.4.0 to 2.5.0. And the 1st test run after the application opened always hang for at least 10 mins before completing. Anyone has any ideas what's going on? 

I have a testcase with multiple steps, all steps finished successfully (as I can see the results in the Transaction Log as PASSED), but the testcase itself got stuck at "RUNNING" for at least 10 more minutes before completing. After that 1st painful run, everything else run fine.