TrayIconBasicCheck manual test fails

JDK/JRE tested: JDK 6 u15 b05
OS/architecture: Windows Vista x86 & Windows 7
Reproducible: Always
Reproducible on machine: stt-72.russia.sun.com
Also reproducible on machine: stt-80.russia.sun.com
Is it a platform specific regression: Y
Regression relative to OS version: Windows XP
Is it a Regression: Not sure

Test results location:
K:\results\1.6.0_15\b05_j4b\awt\manual\TrayIconBasicCheck\

Steps to reproduce:
Login to appropriate host via vnc
Install required JDK
Copy test folder TrayIconBasicCheck to any location and cd to it.
Run java -cp . -DresultsDir=. TrayIconBasicCheck

Process with instructions.
On third testcase no Message Window shown at all