Sikuli IDE disappeared after running Sikuli Script

i am using windows 7 64 bit with Sikulix 1.1.0 nightly 20150610. JDK1.8, Python2.7.10, Jpython 2.7.0
Today suddenly Sikuli IDE disappeared after I hit run in the IDE. But it seems that it is still running but i cannot see the IDE.
Thanks in advance.
Huang Sheng

[debug] Debug: setLogFile: E:/Sikulix/SikulixLog.txt
[debug (15-6-23 23:43:32)] RunTimeINIT: loadOptions: check: E:\Sikulix
[debug (15-6-23 23:43:32)] RunTimeINIT: loadOptions: check: C:\Users\witon
[debug (15-6-23 23:43:32)] RunTimeINIT: loadOptions: check: C:\Users\witon\AppData\Roaming\Sikulix\SikulixStore
[debug (15-6-23 23:43:32)] RunTimeINIT: global init: entering as: IDE
[debug (15-6-23 23:43:33)] RunTimeINIT: ScreenDevice 0 has (0,0) --- will be primary Screen(0)
[debug (15-6-23 23:43:33)] RunTimeINIT: fSxBase: E:\Sikulix
[debug (15-6-23 23:43:33)] RunTimeINIT: runs as sikulix.jar in: E:\Sikulix
[debug (15-6-23 23:43:33)] RunTimeINIT: exists libs folder at: C:\Users\witon\AppData\Roaming\Sikulix\SikulixLibs_201506110100
[debug (15-6-23 23:43:47)] RunTimeINIT: addToWindowsSystemPath: added to systempath:
C:\Users\witon\AppData\Roaming\Sikulix\SikulixLibs_201506110100
[debug (15-6-23 23:43:47)] RunTimeINIT: checkJavaUsrPath: added to ClassLoader.usrPaths
***** show environment for IDE (build 201506110100)
user.home: C:\Users\witon
user.dir (work dir): E:\Sikulix
user.name: witon
java.io.tmpdir: C:\Users\witon\AppData\Local\Temp
running 64Bit on Windows (6.1) from a jar
java 8-64 version 1.8.0_45-b15 vm 25.45-b02 class 52.0 arch amd64
app data folder: C:\Users\witon\AppData\Roaming\Sikulix
libs folder: C:\Users\witon\AppData\Roaming\Sikulix\SikulixLibs_201506110100
executing jar: E:\Sikulix\sikulix.jar
*** classpath dump sikulix
  0: /E:/Sikulix/sikulix.jar
*** classpath dump end
***** show environment end

... more...

[debug (15-6-23 23:44:21)] JythonSupport: ***** Jython sys.path
 0: E:\Sikulix\Lib
 1: E:\Sikulix\sikulix.jar\Lib
 2: __classpath__
 3: __pyclasspath__/
[debug (15-6-23 23:44:21)] JythonSupport: ***** Jython sys.path end

... more...

[debug (15-6-23 23:45:08)] Jython: requested to use as default region: R[0,0 1366x768]@S(0)
[debug (15-6-23 23:45:08)] JythonScriptRunner: runPython: running script from IDE:
E:/Witon/20150624.sikuli
[debug (15-6-23 23:45:08)] Region: exists: waiting 3.0 secs for 1435036333230.png to appear in R[0,0 1366x768]@S(0)
[debug (15-6-23 23:45:08)] Image: loaded: 1435036333230.png (file:/E:/Witon/20150624.sikuli/1435036333230.png)
[debug (15-6-23 23:45:08)] Image: cached: 1435036333230.png (15 KB) (# 1 KB 15 -- 0 % of 64 MB)
[debug (15-6-23 23:45:12)] Region: exists: 1435036333230.png has not appeared [535 msec]
[debug (15-6-23 23:45:14)] Region: find: waiting 3.0 secs for 1435036450806.png to appear in R[0,0 1366x768]@S(0)
[debug (15-6-23 23:45:14)] Image: loaded: 1435036450806.png (file:/E:/Witon/20150624.sikuli/1435036450806.png)
[debug (15-6-23 23:45:14)] Image: cached: 1435036450806.png (7 KB) (# 2 KB 22 -- 0 % of 64 MB)
[debug (15-6-23 23:45:15)] Region: find: 1435036450806.png has appeared
at M[147,330 57x45]@S(S(0)[0,0 1366x768]) S:0.82 C:175,352 [486/416 msec]
[debug (15-6-23 23:45:15)] CLICK on L(175,352)@S(0)[0,0 1366x768]
[debug (15-6-23 23:45:16)] Region: exists: waiting 3.0 secs for 1435036710063.png to appear in R[0,0 1366x768]@S(0)
[debug (15-6-23 23:45:16)] Image: loaded: 1435036710063.png (file:/E:/Witon/20150624.sikuli/1435036710063.png)
[debug (15-6-23 23:45:16)] Image: cached: 1435036710063.png (11 KB) (# 3 KB 34 -- 0 % of 64 MB)
[debug (15-6-23 23:45:19)] Region: exists: 1435036710063.png has not appeared [430 msec]
[debug (15-6-23 23:45:24)] Region: exists: waiting 3.0 secs for 1435036710063.png to appear in R[0,0 1366x768]@S(0)
[debug (15-6-23 23:45:24)] Image: reused: 1435036710063.png (file:/E:/Witon/20150624.sikuli/1435036710063.png)
[debug (15-6-23 23:45:27)] Region: exists: 1435036710063.png has not appeared [528 msec]
[debug (15-6-23 23:45:32)] Region: exists: waiting 3.0 secs for 1435036710063.png to appear in R[0,0 1366x768]@S(0)
[debug (15-6-23 23:45:32)] Image: reused: 1435036710063.png (file:/E:/Witon/20150624.sikuli/1435036710063.png)
[debug (15-6-23 23:45:36)] Region: exists: 1435036710063.png has not appeared [512 msec]

... repeating till abort