How to reproduce :
1) Open a new Writer document
2) Hide sidebar - on my Mac master build for some reason this is already hidden, whereas on Linux I see the icons of the sidebar
2) Menu Insert > Media > Clipart Gallery
3) Nothing happens.
What should happen :
The sidebar should become visible, displaying the clipart gallery.
Note that all of the other menu entries in Insert > Media do something even if the sidebar is hidden.
I can confirm with Version: 126.96.36.199.alpha0+
Build ID: 52fa2e97dfef1a5f27aaee6af7ed80800641b86c
TinderBox: Linux-rpm_deb-x86_64@46-TDF, Branch:master, Time: 2015-02-22_01:03:18
@Jay : adding you to CC, as I believe you did some work on the menu entries here ?
Yes unfortunately this is a known bug that still needs to be fixed and affects all sidebar tabs.
*** This bug has been marked as a duplicate of bug 83546 ***