Perhaps what you have encountered is related to this issue: Applescript fails in FileMaker 11.0v2
This is one of many acknowledged bugs that can be found in the Known Bug List here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: http://www.4shared.com/file/8orL8apk/FMP_Bugs.html
No. getURL should return once the database is open, and the database is showing, or provide an error. Nothing in between.
Yet both that thread and this describe the script as not waiting for a result as it should but instead execution procedes to the next step. Hence the possible connection.
Thank you for your posts.
This is definitely related to the post provided by "PhilModJunk" (Thank you!).
I have attached your posts to the original case being reviewed by our Development and Testing teams. When information becomes available, I will let you know.
As a workaround, until this is changed, insert a delay after the Launch step to make sure FileMaker Pro is fully launched, and then proceed with opening the file.