Netbeans Missing source tab -

i have loaded netbeans, , showing me history tab when go edit code projects. went on view >> editors, editor there history. how source tab back?!

for me, similar issue, after fresh installation, resolved closing running netbeans ide instance, renaming existing netbeans folder found inside c:\users\\appdata\roaming\ on windows 7.

might helpful, refer following links - here & faqwhatisuserdir