After performing a Find, the Repeat Search (default Ctrl+Shift+F) shortcut doesn't work until the focus leaves the Find toolbar.
Steps to reproduce:
1. In Calc and Word (haven't tried the others), press Ctrl-F.
2. Enter a word that occurs multiple times in the document and press Enter.
3. Scroll around, zoom, etc.
4. Press Ctrl+Shift+F to Repeat Search.
So long as the keyboard focus remains in the Find toolbar, the Repeat Search keyboard shortcut does nothing. (Perhaps the Ctrl+Shift+F is not propagated to the main window's shortcut handling?) The workaround is to click in the main window, or realize the keyboard focus is still in the Find toolbar, and continue to press Enter.
It seems other LO keyboard shortcuts don't work if the keyboard focus is in the Find toolbar, e.g. F7 doesn't immediately pop up Spelling (if I repeatedly press F6-F7-F6-F7 the dialog eventually pops up)
In every other program I use that has a find bar, the Find Next keyboard shortcut works regardless of the keyboard focus.
Platform (if different from the browser):
Browser: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120216 Firefox/11.0 SeaMonkey/2.8
Windows/Linux (non MacOS) bug
*** This bug has been marked as a duplicate of bug 45903 ***