Fantastic. Thanks for explaining both methods.
My problem actions are on the QTY text change event which occurs after the actions on my Item text change event. I've got a Show Message Action at the end of the action sequence of the Items actions, and a Show Message at the very beginning of the QTY actions. The Item actions ending message displays, but not the beginning of the QTY sequence.
I've got the Text Change actions of the Item field resetting the QTY field to zero to make sure the QTY based pricing calculations are re-run against new Item data, so I think I might be setting up some weird race condition or otherwise causing the execution to hang within the QTY action sequence due to some bad logic on my part. You've given me some ideas about using the Lose Focus event as an alternative to Text Change, which might give me more control over kicking off the actions.
Now I've got all the tools to debug what I'm doing. Having the tracing mode will save a lot of time as I was needing to move new Show Message actions up through the action sequence, one position at a time.
Cheers,
James