At least since 24.07, nothing happens when this dialogs must be shown. 'File/Export' command displays "I/O error" message.
Should be fixed by the same commit as Bug 78845. *** This bug has been marked as a duplicate of bug 78845 ***
Confirmed on Windows only when the Tools --> Options --> General Open/Save dialogs check-box "Use LibreOfficeDev dialogs" is checked. With it unchecked, all Windows system file dialogs function as expected. Version: 4.4.0.0.alpha0+ Build ID: c2fd8c4492e9eb12375f78ceb188c87d8fac41b7 TinderBox: Win-x86@39, Branch:master, Time: 2014-07-27_03:39:57 and through today's build. Version: 4.4.0.0.alpha0+ Build ID: aa0e3701aad1a8a955773e869d9a6b59eac51e72 TinderBox: Win-x86@39, Branch:master, Time: 2014-08-10_07:00:24 Will check things again when Maxim M's commit http://cgit.freedesktop.org/libreoffice/core/commit/?id=b73ee73da55c5a00acc9adffc825157dd5b375e6 for bug 78845 rolls through.
And for what its worth, of just the TB39 Windows builds I had on hand, the LibreOffice Open/Save dialogs last worked with Version: 4.4.0.0.alpha0+ Build ID: a532e2bba1a2400925e5930d20ab6fd573171085 TinderBox: Win-x86@39, Branch:master, Time: 2014-06-26_00:23:42 and were first broken with Version: 4.4.0.0.alpha0+ Build ID: 3fdd4f069d5436cf39708004af7fda8175fbc4c2 TinderBox: Win-x86@39, Branch:master, Time: 2014-07-09_02:51:54
(In reply to comment #1) > Should be fixed by the same commit as Bug 78845. > > *** This bug has been marked as a duplicate of bug 78845 *** Verified Fixed on Windows 7 sp1, 64-bit en-US with Version: 4.4.0.0.alpha0+ Build ID: ad85ce18d3939170e5ef7b1a1f8e5dda2c8aeb9c TinderBox: Win-x86@39, Branch:master, Time: 2014-08-11_05:21:44