Thank you for posting.
Could you please provide a little more information? What is your operating system and FileMaker version? Are you currently logged into the computer with an Admin account?
Here are two articles from our Knowledge Base which may apply:
Thank you so much for your response & concern. Yes, I am logged into my computer with an Admin account. I will check out the article links you sent me. Here's my computer/FM info:
MacPro 2x2.66 GHz Dual-Core Intel Xeon 3 GB 667 MHz DDR2 FB-DIMM OSX v10.6.3 | Filemaker Pro 10.0v3