Hi Death, or probably to correct what I wrote above, it's not that your customized SidePane.htm has it missing - it's that MiniSidePane.js is not compatible with your customized SidePane.htm and won't work right, like I wrote above here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=6507.385

If you want to use MiniSidePane.js you would need to have the default SidePane.htm , not a modified one.

So either remove MiniSidePane.js or keep MiniSidePane.js and restore the default SidePane.htm .

If don't have the original SidePane.htm then do a reinstall to get the default UI back again.

- Michael