18.10 Compiz Viewport Switcher - 2 options Disabled

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Compiz > Viewport Switcher > Desktop-based Viewport Switching, 5th and 6th options: Move Next and Move Prev.

After clean install of 18.10 (over 18.04.1) any attempt to change these, eg to Button5 and Button4 respectively (Mouse wheel Down/Up), appears to work during the input selection process, but then results in them still being set to Disabled afterwards. So no way to switch viewports via a mouse.

When I previously did a 18.04.1 upgrade to 18.10, it should have been OK as my preferences would have already had these buttons set. However, while Move Prev remained set, and worked, Move Next was already Disabled and did not work. As soon as I clicked on Move Next it also went Disabled. Neither will take changes.

Both work fine on 18.04 and 18.04.1. However I would note something odd on 18.04.1 (which was not present in 18.04.0): While Move Next/Prev both still function on 18.04.1, if you look at them in Compiz CCM under 18.04.1 the fields display BLANK rather than Button5/Button4. (If you click on either of the Pencil edit buttons, the value of the Button5/4 then appears.) So something was starting to go wrong before 18.10 possibly.

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WORKAROUND: The regression bug appears to be in the entry process. So to make those settings change you need to go to Preferences (on the entry page) and Export the current profile (probably 'mate'). Edit the resulting file to include - if not already present):

[vpswitch]
s0_next_button = Button5
s0_prev_button = Button4

and save, then in Preferences re-Import.

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The problem is more widespread? Appears to affect any setting in Compiz Config Settings Manager which addresses the Mouse settins! Ie. has the mouse icon on left and the 3 buttons on the right (Current value / Edit / Clear) REGARDLESS of panel.

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Fixed in - or before - initial releasee of Ubuntu MATE 20.04 Focal Fossa alpha release. Can be closed.