Slots and Connection of Forms...

[Rhayader]

in second the SLOT is a

void Second::func_clicked()

void Second::func_clicked()

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and you have a

void discovery::func_clicked()

void discovery::func_clicked()

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Maybe the discovery is a relic from the previous implemantation?
(the same for the destructor. Does it compile???)

Check this:
http://www.qtcentre.org/faq.php?faq=qt_signalslot