Thank you for the post.
Following the steps provided, I was able to replicate with FileMaker Pro 12.0v3 connecting to FileMaker Server 12.0v4 installed to Mac OS X 10.7.5 and on a FileMaker Server 12.0v4 Advanced installed to Windows Server 2008 R2 SP1.
I forwarded a full report to Testing and Development for review.
And I've updated the Bugs List to reflect this. Thanks Fred!!!!!!!!!!!!!!!!!!
This bug is still living on FileMaker Server 12.0v5.
Result : Server 12.0v3
I know, i know : this release is java-oriented only.
Phil: For nothing : it is an honor for me to participate to your incredible job.