Disabling transparency disable also click through

[ElToupet]

Hello,
(i checked others question and didn't found a corresponding one)

I use meter from a while it works fine, but today, i changed the transparency to "false", so i can capture meter in front of TERA, but it also disables the click through feature.

I switched it on/off, the icon changes (arrow or dots) so the click through shortcut was working, but actually, the clickthrough doesn't work at all.

I put back transparency "true", works fine.....
then changed again to no transparency and crap again :/

I tried with game in full screen, same, windowed, same...

So, it seems disabling transparency also disables click through, whatever the clickthrough state.

-update-
Looks like removing the "always on top" option get the window in background, so it doesn't interfer with TERA.
But it' gets weird since we can't see meter while playing, and no gauge and enrage points T_T