Ron,

> I'm currently running IB Objects v4.7 and just moved to Firebird 2.1x.
> I thought that everything was working fine, but am having trouble with
> an error, "Invalid Transaction Handle (expecting explicit transaction
> start)", even after using an explicit "StartTransaction".

It would be helpful to see the call stack on the exception.

> Will moving to v4.9 solve the problem?

I recommend that you try it on the current beta 4.9.13 Beta 16 and see what
it does. If you have a problem there, I will quickly fix it for you. Please
use the bug tracking system as I will tend to place priority on those
issues.

Jason