A misstake when running forms

Have somebody seen anything like this?:
When I'm running forms width multi record blocks and everything seems to be OK, but then something happens and I want to change records but the mouse click doesn't move the cursor to the needed record on any form. If I use the up/down keys I can change records. I have to exit all open forms and start again. It comes up quiet often (5-10 min).
I'm experiencing this problem since we installed Forms Builder 6i Rel:2 with patch:12.
Can somebody help me to fix it?

We also encountered this in our application.
Our case is as follows, we have a list of records that should not be enterable and we have a When-Mouse-Click trigger on the list_items that only goes to a hidden List_Anchor item in order to highlight the record clicked.
Anyway it doesn't work at all in any of the releases we installed Forms 6i, patch 11 and then patch 12.
My guess that there is a problem with the Mouse-Clicked event. It is not handled correctly. Is this the case? Maybe a future patch to solve this problem?
A.

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