Android ListView - Unclickable Checkbox

I am hoping someone has seen this problem before. I have a listview where all the elements have a checkbox. This all works well, except that there is one checkbox that is unselectable (can't check and uncheck it). It isn't the first item in the list, and the problem isn't there on all devices. Works fine on a Samsung S3, but has a problem on the Nexus 6P.

After some investigating I turned on 'Show layout bounds' in the developer options. This is where I saw something very interesting, the unclickable element didn't draw any bounds. In the example below the checkbox for 'Bar Tunes' is unselectable.

Does anyone have an idea why this might be happening. Here is the layout file.

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://ift.tt/nIICcg"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:paddingRight="@dimen/list_10sp"
    android:gravity="center_vertical"
    android:id="@+id/listRow"
    android:background="@color/GreyLight">

    <FrameLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <CheckBox
            android:layout_width="@dimen/list_40sp"
            android:layout_height="@dimen/list_40sp"
            android:layout_marginLeft="@dimen/list_5sp"
            android:checked="true"
            android:id="@+id/selectedCheckbox"
            android:button="@drawable/button_checkbox_image"
            android:layout_gravity="center_vertical"/>

        <ImageView
            android:id="@+id/connectedIcon"
            android:src="@drawable/tick_raw"
            android:adjustViewBounds="true"
            android:layout_width="@dimen/list_20sp"
            android:layout_height="@dimen/list_20sp"
            android:layout_marginLeft="@dimen/list_20sp"/>

    </FrameLayout>

    <LinearLayout
        android:orientation="horizontal"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:id="@+id/textBackground">

        <LinearLayout
            android:orientation="vertical"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:paddingRight="@dimen/list_10sp"
            android:paddingTop="@dimen/list_5sp"
            android:paddingBottom="@dimen/list_5sp"
            android:clickable="true"
            android:id="@+id/searchList"
            android:background="@drawable/button_list_item"
            android:layout_height="wrap_content">

            <com.hdms.manager.Drawable.NightlifeTextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="List Name"
                android:textSize="@dimen/list_text_size"
                android:textStyle="bold"
                android:id="@+id/listName"
                android:singleLine="true"
                android:ellipsize="middle"/>

            <com.hdms.manager.Drawable.NightlifeTextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="@dimen/playlist_neg_2sp"
                android:text="(User Friendly Name)"
                android:textSize="@dimen/playlist_text_size"
                android:singleLine="true"
                android:id="@+id/friendlyName" />

            <com.hdms.manager.Drawable.NightlifeTextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="List Description"
                android:textSize="@dimen/list_text_size_smaller"
                android:singleLine="true"
                android:id="@+id/listDescription" />
        </LinearLayout>

        <ImageButton
            android:layout_width="@dimen/playlist_40sp"
            android:layout_height="@dimen/playlist_40sp"
            android:padding="@dimen/account_2sp"
            android:layout_marginLeft="@dimen/account_5sp"
            android:layout_gravity="center"
            android:visibility="gone"
            android:scaleType="fitCenter"
            android:id="@+id/crowdDJButton"
            android:src="@drawable/crowddj_icon"
            android:background="@drawable/button_background_green"/>

        <ImageButton
            android:layout_width="@dimen/playlist_40sp"
            android:layout_height="@dimen/playlist_40sp"
            android:src="@drawable/icon_nm"
            android:layout_gravity="center"
            android:visibility="gone"
            android:layout_marginLeft="@dimen/account_5sp"
            android:scaleType="fitCenter"
            android:tint="@color/White"
            android:background="@drawable/button_background_green"
            android:padding="@dimen/account_2sp"
            android:id="@+id/musicSystemButton"/>

        <ImageView
            android:layout_width="@dimen/playlist_20sp"
            android:layout_height="@dimen/playlist_20sp"
            android:padding="@dimen/playlist_2sp"
            android:layout_marginRight="@dimen/player_5sp"
            android:layout_gravity="center_vertical"
            android:visibility="gone"
            android:id="@+id/crowdDJSearchable"
            android:background="@color/StormGreen"
            android:src="@drawable/crowddj_icon"/>

        <com.hdms.manager.Drawable.NightlifeTextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:textColor="@color/White"
            android:text="0"
            android:textSize="@dimen/list_text_size_smaller"
            android:minWidth="@dimen/list_45sp"
            android:minHeight="@dimen/list_25sp"
            android:singleLine="true"
            android:ellipsize="marquee"
            android:id="@+id/songCount"
            android:layout_gravity="center_vertical"
            android:background="@drawable/border_rounded_darkgrey"/>

        <ImageView
            android:id="@+id/dot"
            android:src="@drawable/dot_dot_dot"
            android:adjustViewBounds="true"
            android:visibility="gone"
            android:layout_gravity="center_vertical"
            android:layout_marginRight="@dimen/account_10sp"
            android:layout_width="@dimen/list_20sp"
            android:layout_height="@dimen/list_20sp"/>

    </LinearLayout>

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="@dimen/list_1sp"
        android:background="@drawable/verticalline"/>
</LinearLayout>

Any suggestions for how to fix or track down this problem? Thanks