Thanks for your suggestion but I still have no luck... 

My example code above didn't have the scrollbar set to always but I checked my project and I have other grids that have the scrollbar set to always that still have the scrollbar overlapping the last column.  In fact all of my grids have that overlapping problem.

Here's an example of my problem for anyone having trouble visualizing the problem:

 Still looking for solution.... 

It looks like a bug, you should report it....

 if you set the scroll bar to always the problem disappears...

Here's the code i'm using for one of my grids: 

                     <igtbl:UltraWebGrid ID="gvReceiver" runat="server" Width="100%" DisplayLayout-GridLinesDefault="Horizontal" Height="590px" DisplayLayout-ColWidthDefault="75px">
                    <Bands>
                        <igtbl:UltraGridBand ChildBandColumn="MEMO" Key="BandInfo"  >
                            <AddNewRow View="NotSet" Visible="NotSet">
                            </AddNewRow>
                            <Columns>
                                <igtbl:UltraGridColumn AllowGroupBy="No" AllowRowFiltering="False" AllowUpdate="Yes" DataType="System.Boolean" HeaderText="Sel" Key="chkSel" Type="CheckBox" Width="2%" >
                                    <Header Caption="Sel" Title="Sel"></Header>
                                </igtbl:UltraGridColumn>
                                
                                <igtbl:UltraGridColumn BaseColumnName="IDNO1" HeaderText="Equipment#" Key="IDNO1" Width="10%"  >
                                    <Header Caption="Equipment#" Title="Equipment#"><RowLayoutColumnInfo OriginX="15" /></Header>
                                </igtbl:UltraGridColumn>
                                
                                <igtbl:UltraGridColumn BaseColumnName="EQMFCD" HeaderText="Make" Width="5%" >
                                    <Header Caption="Make" Title="Make" ><RowLayoutColumnInfo OriginX="15" /></Header>
                                </igtbl:UltraGridColumn>
                                
                                <igtbl:UltraGridColumn BaseColumnName="EQMFS2" HeaderText="Serial Number" Width="10%" >
                                    <Header Caption="Serial Number" Title="Serial Number"><RowLayoutColumnInfo OriginX="8" /></Header>
                                </igtbl:UltraGridColumn>
                                
                                <igtbl:UltraGridColumn BaseColumnName="ACTDESC" HeaderText="Activity" Key="ACTDESC" Width="15%">
                                    <Header Caption="Activity"><RowLayoutColumnInfo OriginX="6" /></Header>
                                </igtbl:UltraGridColumn>
                                
                                <igtbl:UltraGridColumn BaseColumnName="DATE" DataType="System.DateTime" Format="MM/dd/yyyy" HeaderText="Agrmt Date" Key="DATE" Width="8%" >
                                    <Header Caption="Agrmt Date" title="Agreement Date" ><RowLayoutColumnInfo OriginX="4" /></Header>
                                </igtbl:UltraGridColumn>
                                
                                <igtbl:UltraGridColumn BaseColumnName="DTSHR8" HeaderText="Agrmt Date" Key="DTSHR8" Hidden="true">
                                    <Header Caption="Agreement Date"><RowLayoutColumnInfo OriginX="4" /></Header>
                                </igtbl:UltraGridColumn>
                                
                                <igtbl:UltraGridColumn BaseColumnName="MODEL" HeaderText="Model" Key="MODEL" Width="10%" >
                                    <Header Caption="Model" Title="Model"><RowLayoutColumnInfo OriginX="1" /></Header>
                                </igtbl:UltraGridColumn>
                                
                                <igtbl:UltraGridColumn BaseColumnName="SHIPFROM" HeaderText="From Location" Key="SHIPFROM" Width="20%" >
                                    <Header Caption="From Location"><RowLayoutColumnInfo OriginX="6" /></Header>
                                </igtbl:UltraGridColumn>
                                
                                <igtbl:UltraGridColumn BaseColumnName="SHIPLOC" HeaderText="To Location" Key="SHIPLOC" Width="20%" >
                                    <Header Caption="To Location"><RowLayoutColumnInfo OriginX="6" /></Header>
                                </igtbl:UltraGridColumn>
                            </Columns>
                        </igtbl:UltraGridBand>
                    </Bands>
                    <DisplayLayout AllowSortingDefault="OnClient" HeaderClickActionDefault="SortSingle" Name="gvContracts" RowHeightDefault="20px" RowSelectorsDefault="No" SelectTypeRowDefault="Extended" StationaryMarginsOutlookGroupBy="True" Version="4.00" AutoGenerateColumns="False" ColWidthDefault="5%" FixedHeaderIndicatorDefault="NotSet" ColFootersVisibleDefault="NotSet" HeaderTitleModeDefault="OnOverflow" GridLinesDefault="Horizontal" ScrollBarView="Vertical">
                        <FrameStyle BorderColor="InactiveCaption" BorderStyle="None" Height="590px" Width="100%" Font-Bold="True" ></FrameStyle>
                        <GroupByBox><Style BackColor="ActiveBorder" BorderColor="Window"></Style></GroupByBox>
                        <GroupByRowStyleDefault BackColor="Control" BorderColor="Window"></GroupByRowStyleDefault>
                        <ActivationObject BorderStyle="solid" BorderColor="Silver" BorderWidth="2px"></ActivationObject>
                        
                            <HeaderStyleDefault       CssClass="newIFgridheader"></HeaderStyleDefault>
                            <RowStyleDefault          CssClass="newIFgridrow" ></RowStyleDefault>
                            <RowAlternateStyleDefault CssClass="newIFaltrow"></RowAlternateStyleDefault>    
                                                                    
                        <FilterOptionsDefault RowFilterMode="AllRowsInBand" AllowRowFiltering="OnServer">
                            <FilterDropDownStyle CssClass="newIFgridfilter" ></FilterDropDownStyle>
                            <FilterHighlightRowStyle CssClass="newIFgridfilterhighlight" ></FilterHighlightRowStyle>
                        </FilterOptionsDefault>

                        <Pager MinimumPagesForDisplay="2" StyleMode="ComboBox">
                            <Style BackColor="LightGray" BorderStyle="Solid" BorderWidth="1px">
                            </Style>
                        </Pager>
                    </DisplayLayout>
                </igtbl:UltraWebGrid>