I'll echo most of what others have already said here. But I'll add a few other approaches as well.
You'll want to narrow down if you're dealing with a property issue, report issue, UI issue, etc.
For example, start small and start simple.
First try to use a different, basic property you know already works. Now make it read only.
If you see the issue here, then we have a problem with the read only functionality.
If you do not see the issue here, then the issue seems tied to a specific property. Then you'll want to find out what is unique about this particular property and so on.
Attacking methodically like this should hopefully quickly narrow down where the underlying issue is so that we can help narrow it down further and eventually resolve ;)