Thank you for your post.
Unfortunately, I am unable to replicate the problem. I have FileMaker Server Advanced 10 running on Windows Server 2003. I launch Firefox 3.5.11 on Windows XP, and Firefox 184.108.40.206 on Mac OS X 10.5.8. In both cases, both buttons inside of portals and tooltips work properly.
Does this occur with every file or a specific file? If you use FileMaker Pro and Instant Web Publishing, do you get the same results? What version of Windows Server are you running FileMaker Server Advanced 10?
Any other information you can provide may be helpful in determining the cause.
Can you please contact me off-line and I will send you a private link to access this app.
It is IWP, hosted on FileMaker Server Advanced 10.0 and this occurs with every file using a portal.
We host with www.triple8.net.
I have sent you a private message. Please check your Inbox at the top of this page.