Thank you for the post and the link to the previous report.
I can confirm the issue with Chrome still exists in FileMaker Server 13.0v9. I have attached your post to the original report. When more information becomes available, this thread will be updated.
Same problem testing with both Windows Chrome 43 and Mac Chrome 43
But iOS Chrome 43 works.
My apologies for not catching this sooner.
This issue has been fixed in WebDirect 14.