Launchbar fails to execute script

I have a script which executes fine when run from the Menu bar but when I try to launch it with LaunchBar it fails. Here is the scripts:

tell application id "com.devon-technologies.thinkpro2" to set the bounds of think window 1 to {156, 25, 1351, 865}
display dialog "Return to edge?"
tell application id "com.devon-technologies.thinkpro2" to set the bounds of think window 1 to {9, 22, 1204, 862}

What I am experiencing is that the LB dock icon bounces when it gets to the display dialog stage and I have to click on the icon and then the dialog appears for me to select.

Any ideas how to cure this please would be much appreciated.

Cheers.