Thank you for your post.
Although you cannot format a time field for decimals, you can definitely enter the decimals into the time field.
This is what I have done in both FileMaker Pro 9 and FileMaker Pro 10.
Create a new table with the following fields:
Time1 (Time field)
Time2 (Time field)
CalcTime (Calculation resulting in Time) = Time1 + Time 2
In Browse mode, I entered the following information:
In CalcTime, my result is: 0:34:44.38
Please let me know what is occurring for you, and we'll progress from there.
Thanks for the suggestion. I guess that I can do this, although it means going back and changing a lot of formats in my database. Still, someone at FileMaker ought to fix this bug. It's persisted through three upgrades now.