Here's the grid panel markup....in this example the the grid has the "UserSuit" icon, and the ImageCommandColumn features two items...one has the "UserSuit" icon, and the other has the "ComputerEdit" icon.
UserSuit icon shows fine, the ComputerEdit icon does not display, only the text for the command.
If I switch the grid to use the ComputerEdit icon then the scenario reverses (ComputerEdit icon shows up and the UserSuit ImageCommand icon vanishes).
<ext:GridPanel ID="GridPanel1" runat="server" Title="Employee Listing" Icon="UserSuit" StoreID="Store1" Frame="true" Floating="true" ClicksToEdit="2" Width="1024" Height="600" >
<LoadMask ShowMask="true" />
<SaveMask ShowMask="true" />
<ColumnModel runat="server" Width="1000" >
<Columns>
<ext:Column ColumnID="ID" DataIndex="ID" Header="ID" Editable="false" Width="40" Align="Center" Hidden="true"/>
<ext:Column ColumnID="EmployeeID" DataIndex="Biz_NFX_EMP_ID" Header="Employee #" Width="50" Align="Center"/>
<ext:Column DataIndex="Name_First" Header="First Name" Align="Left" Width="80" Locked="true"/>
<ext:Column DataIndex="Name_Last" Header="Last Name" Align="Left" Width="80" Locked="true"/>
<ext:Column DataIndex="Biz_Title" Header="Title" Align="Left" Width="80"/>
<ext:Column DataIndex="Biz_Manager" Header="Reports To" Align="Left" Width="100"/>
<ext:Column DataIndex="Biz_Department" Header="Department" Align="Left" Width="80"/>
<ext:Column DataIndex="Office_Loc" Header="Location" Align="Left" Width="80"/>
<ext:Column DataIndex="Biz_EMP_TYPE_CD" Header="Type" Align="Center" Width="60"/>
<ext:Column DataIndex="Biz_Region" Header="Business Unit" Align="Left" Width="80"/>
<ext:DateColumn DataIndex="D_Start" Header="Start Date" Align="Left" Width="100" />
<ext:ImageCommandColumn Width="110" Tooltip="Commands you can use with this grid's data." Sortable="false" Hideable="false" Header="Tools">
<Commands>
<ext:ImageCommand Icon="ComputerEdit" Text="Equip" CommandName="Equipment">
<ToolTip Text="Click to edit this employee's office and IT equipment setup." Title="Edit employee equipment" />
</ext:ImageCommand>
<ext:ImageCommand Icon="UserSuit" Text="Red Carpet" CommandName="RedCarpet">
<ToolTip Text="Click to work with this employee's onboarding information." Title="Work with the employee's Red Carpet On-Boarding records." />
</ext:ImageCommand>
</Commands>
</ext:ImageCommandColumn>
</Columns>
</ColumnModel>
<View>
<ext:GridView ID="GridView1" runat="server" ForceFit="true">
<GetRowClass Fn="getRowClass" />
</ext:GridView>
</View>
<SelectionModel>
<ext:RowSelectionModel ID="RowSelectionModel1" SingleSelect="true" runat="server">
<Listeners>
<RowSelect Handler="#{btnDelete}.enable();#{EmpForm}.getForm().loadRecord(record);#{EmpForm}.record = record;" />
<RowDeselect Handler="if (!#{GridPanel1}.hasSelection()) {#{btnDelete}.disable();}" />
</Listeners>
</ext:RowSelectionModel>
</SelectionModel>
<Buttons>
<ext:Button ID="Button1" runat="server" Text="Add" Icon="Add">
<Listeners>
<Click Handler="var rowIndex = #{GridPanel1}.addRecord(); #{GridPanel1}.getView().focusRow(rowIndex); #{GridPanel1}.startEditing(rowIndex, 0);" />
</Listeners>
</ext:Button>
<ext:Button ID="btnDelete" runat="server" Text="Delete" Icon="Delete" Disabled="true">
<Listeners>
<Click Handler="#{GridPanel1}.deleteSelected();if (!#{GridPanel1}.hasSelection()) {#{btnDelete}.disable();}" />
</Listeners>
</ext:Button>
<ext:Button ID="Button3" runat="server" Text="Save" Icon="Disk">
<Listeners>
<Click Handler="#{GridPanel1}.save();" />
</Listeners>
</ext:Button>
<ext:Button ID="Button4" runat="server" Text="Clear" Icon="Cancel">
<Listeners>
<Click Handler="#{GridPanel1}.clear();if (!#{GridPanel1}.hasSelection()) {#{btnDelete}.disable();}" />
</Listeners>
</ext:Button>
<ext:Button ID="Button5" runat="server" Text="Refresh" Icon="ArrowRefresh">
<Listeners>
<Click Handler="#{GridPanel1}.reload();" />
</Listeners>
</ext:Button>
</Buttons>
<DirectEvents>
<RowDblClick OnEvent="EditEmployee">
<ExtraParams>
<ext:Parameter Name="Values" Value="#{GridPanel1}.getRowsValues({selectedOnly:true})" Mode="Raw" />
</ExtraParams>
</RowDblClick>
<Command OnEvent="RowCommandHandler">
<ExtraParams>
<ext:Parameter Name="Employee" Mode="Raw" Value ="record.data" />
<ext:Parameter Name="CMD" Mode="Raw" Value="command" />
</ExtraParams>
</Command>
</DirectEvents>
<Plugins>
<ext:GridFilters runat="server" Local="true">
<Filters>
<ext:StringFilter DataIndex="Name_Last" AutoDataBind="true"/>
</Filters>
</ext:GridFilters>
</Plugins>
</ext:GridPanel>