Hi,

I found the cause. I have set my BO as Form.PrimaryBusinessObject, I also have dropped a BusinessBindingSource on form which also set the same BO to its BusinessObject property.



Just FYI, the BBS is already there for long time. Just that it didn't cause problem before upgrade. Strange.



Anyway, thank you help and sorry for my mistake.



Thank you

No problem... I'm glad you found the source of the issue.

Glad you found your problem...I didn't think that the update would have made a difference, so I am glad you got it going