When tweaking the Audio Mixer at runtime, the Pause button is enabled and also the Console is showing the following errors:

GUI Error: You are pushing more GUIClips than you are popping. Make sure they are balanced)

MethodAccessException: Error verifying EqualizerCustomGUI/<DrawFilterCurve>c__AnonStorey1:<>m__1 (single): Method UnityEditor.ComplexD:Exp (double) is not accessible at 0x0020
UnityEditor.AudioCurveRendering.DrawCurve (Rect r, UnityEditor.AudioCurveEvaluator eval, Color curveColor) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Audio/Effects/AudioCurveRendering.cs:205)
EqualizerCustomGUI.DrawFilterCurve (Rect r, System.Single[] coeffs, Double lowGain, Double midGain, Double highGain, Color color, Boolean filled, Double samplerate, Double magScale)
EqualizerCustomGUI.DrawControl (UnityEditor.IAudioEffectPlugin plugin, Rect r, Single samplerate)
EqualizerCustomGUI.OnGUI (UnityEditor.IAudioEffectPlugin plugin)
UnityEditor.AudioMixerEffectView.DoEffectGUI (Int32 effectIndex, UnityEditor.Audio.AudioMixerGroupController group, System.Collections.Generic.List`1 allGroups, System.Collections.Generic.Dictionary`2 effectMap, System.Int32& highlightEffectIndex) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Audio/Mixer/GUI/AudioMixerEffectView.cs:329)
UnityEditor.AudioMixerEffectView.OnGUI (UnityEditor.Audio.AudioMixerGroupController group) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Audio/Mixer/GUI/AudioMixerEffectView.cs:119)
UnityEditor.AudioMixerGroupEditor.OnInspectorGUI () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Inspector/AudioMixerGroupEditor.cs:39)
UnityEditor.InspectorWindow.DrawEditor (UnityEditor.Editor editor, Int32 editorIndex, Boolean forceDirty, System.Boolean& showImportedObjectBarNext, UnityEngine.Rect& importedObjectBarRect, Boolean eyeDropperDirty) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Inspector/InspectorWindow.cs:1144)
UnityEditor.DockArea:OnGUI()

To reproduce:
- Open attached project and launch "test" scene
- Open "test" audio mixer
- Hit Play
- Hit Edit in Playmode
- Go to audio group "909" and tweak the Attenuation fader up/down
- Observe that the Pause button is enabled
- Observe also the error messages in Console

See also attached video for further details.