In version 5.12 from the Debian Unstable repository (5.12.0-2), at least, I cannot manually edit numerical values anymore. For example, the values of the faders in the mixer, or even in parameter values in plugins, like EQ10Q.
There are workarounds, I suppose, but I thought I should mention it.
(I just tried KXStudio version too: 5.12.0-1kxstudio1v5. Same problem.)
there are no problems with mixer fader value (one click rmb and enter a value). Also have no problems in plugin’s generic view (double click rmb in any parameter and enter a value, including the EQ10Qplugin).
With EQ10Q I have an entering value problem (5.11&5.12) in the plugin's UI itself. Suppose it's a problem of a specific plugin.