Oracle Forms Builder Has Stopped Working

Hello all.

I have a problem while opening a form in oracle form builder.

I use Windows 7 and Oracle Form Builder 10g.

When I compile a form, suddenly the form builder has stopped working. Then I close the form builder and try to reopen my form.

I make connection to database first, then i open my form. The form builder has stopped working again.

This form used to contain of pll file, but then i removed it. I modified this form, opened and closed this form, and had no issue at all.

I try to open another form but there is no issue.