Hi!
2. To find out if it's a memory issue, you can increase the allowed memory for LoadUI by modifying loadUI.bat, and then starting LoadUI using loadUI.bat. You want to try setting
Xmx to a higher value by changing
Xmx1024m (1024 MB) to something higher.
So this row in loadUI.bat:
set JAVA_OPTS=-Xms128m -Xmx1024m -XX:MaxPermSize=256m
...should be changed as follows (for example):
set JAVA_OPTS=-Xms128m -Xmx2000m -XX:MaxPermSize=256m
LoadUI 2.6 (scheduled for release July 31) includes a System Log which contains error messages in cases like this, which makes it much easier to troubleshoot.
Please keep us updated on this!

Henrik O
SmartBear Software