Default blank rows not shown

Hi there,
I created some master detail forms. When i'm pressing the add rows button the form navigates to the last row, the total rows number in the pagination box increases with 1, but no blank row is shown. Anybody any idea why?
Apex 3.0.1
Kind regards,
Martin Schaap

I have some new information, maybe this triggers someone.
In order to detect the problem, I dropped the master detail form and started all over again. After initial creation of te master detail form the 'Add row' button just worked fine. It also did after some replacement of the fields and adding lookups and formatting.
At last I added an 'search'-field and changed the query to support this search-field.
I entered a search criterium and pressed the 'Add rows' button. It still worked fine. After removing the search criterium all rows where displayed again, but the 'Add rows' button didn't work anymore. Assuming that perhaps something still remains in a buffer or whatever I expanded the query by adding 'or :PX_SEARCH IS NULL', but from this point nothing did help. Even after removing the search-field and restoring the query, the 'Add rows' button still didn't work. It goes to the last record(set) but no default blank line is shown anymore.

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