Sheet navigation buttons not working (or how to move to first sheet?)

I’m on Linux Mint 17, L.O. 4.2.4.2.

None of the buttons on the sheet tab bar for moving between sheets are working. They change appearance when clicked, as expected, but the sheet focus doesn’t change. I didn’t see a bug report for this.

What I really need is a keyboard shortcut for moving to the first sheet. I don’t see that option anywhere in the list of available actions in the Customize dialog.

Thanks.

These controls are not made for navigation from sheet to sheet (changing focus) but for scrolling the row of tabs if it doesn’t completely fit into the available part of the horizontal scrollbar range. You may change the width of this part by dragging the splitter at its right.

A sheet is selected by clicking the tab or by navigating through the tabs by Ctrl+PageUp (to the left) and Ctrl+PageDown (to the rifght).

Thanks for the reply.