This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
I'm using Ubuntu 12.04. I have Netbeans 7.0.1 installed and Subversion 1.6.17. After a fresh install of Netbeans, I go to Team->Subversion->Checkout. Nothing happens. No window appears. Netbeans does not appear to hang as other functionality works. It's as if I never clicked it at all. For comparison, when I attempt to do Team->CVS->Checkout, the checkout wizard window does appear as expected.
Start with a fresh userdir (any difference?) and attach the messages log after the action is invoked.
I was able to resolve the issue by downloading and installing Netbeans directly from the Netbean's site and bypassing the version in Ubuntu's repositories. I don't know if Ubuntu applies any additional patches to their version, but I might file a bug report with the Ubuntu devs since the upstream version is working correctly.
Closing then. If you're able to reproduce with the official version from the download page, attach the log and reopen.