[gm9]

It seems the BankPage location is recalculated each time you change the hotbar window size, so you may have to reset it OnHoverIn.

Quick hack into my hotbar window to make it work:

<?xml version="1.0" encoding="utf-8"?>
<Page clientmarginFrame="10,10,5,10" clientmarginNone="10,10,5,10" eq2usescomwndcontrols="true" Location="307,717" Name="Hotkey" OnHoverIn="BankPage.Location=Grab2ResizeDummyN.Placer.Location" OnShow="MinimumSize=&apos;0,0&apos;
VerticalSizeOf40ResizeBugAndOnShowNotWorkingOnNewHotbarOpenBugWorkaround.Size=IconPage.Icons.Size
IconsSize=IconPage.Icons.Size
Size=VerticalSizeOf40ResizeBugAndOnShowNotWorkingOnNewHotbarOpenBugWorkaround.RealHotkeySize.Size
IconPage.Icons.Size=IconsSize" PackLocation="npn,fff" PackLocationProp="0307/1024,-019/0001" PackSize="f,f" PackSizeProp="0002/0003,0002/0003" ScrollExtent="396,32" Size="396,32" UserMovable="true" UserResizable="true" version="2.0">
<Page Name="Grab2ResizeDummyN" PackLocation="left,top" PackLocationProp="0000/0001,0000/0001" PackSize="a,f" PackSizeProp="0000/0001,0002/0003" ScrollExtent="396,1" Size="396,1">
<Button Name="Placer" PackLocation="center,top" Size="12,1"/>
</Page>
<Page Name="Grab2ResizeDummyW" PackLocation="left,top" PackLocationProp="0000/0001,0000/0001" PackSize="f,a" PackSizeProp="0002/0003,0000/0001" ScrollExtent="1,32" Size="1,32"/>
<Page Location="395,0" Name="Grab2ResizeDummyE" PackLocation="right,top" PackLocationProp="-001/0001,0000/0001" PackSize="f,a" PackSizeProp="0002/0003,0000/0001" ScrollExtent="1,32" Size="1,32"/>
<Page Location="0,31" Name="Grab2ResizeDummyS" PackLocation="left,bottom" PackLocationProp="0000/0001,-001/0001" PackSize="a,f" PackSizeProp="0000/0001,0002/0003" ScrollExtent="396,1" Size="396,1"/>
<Page AbsorbsInput="false" Name="BankPage" OnHide="Parent.MinimumSize=&apos;0,0&apos;" OnShow="Location=Parent.Grab2ResizeDummyN.Placer.Location Parent.MinimumSize=&apos;0,0&apos;" ScrollExtent="396,32" Size="396,32">
<Text AbsorbsInput="false" Color="#F0D080" Font="/ProfitUI_Styles.Fonts.FontArial12T" LocalText="10" Location="0,9" Name="CurrentBank" ScrollExtent="12,14" ShadowStyle="/ShadowStyles.BlackOutlineNoShadow.Outline2" Size="396,14" TextAlignment="Center" TextAlignmentVertical="Center">10</Text>
<Checkbox AbsorbsInput="false" LocalTooltip="Show move target" Location="0,11" Name="ToggleMoveTarget" OnSet="Parent.Parent.IconPage.MoveButton.Visible=true
Tooltip=&apos;Hide move target&apos;" OnUnset="Parent.Parent.IconPage.MoveButton.Visible=false
Tooltip=&apos;Show move target&apos;" ScrollExtent="12,10" Size="12,10" Tooltip="Show move target" />
<Button AbsorbsInput="false" LocalText="Up" LocalTooltip=":b7d61af6404eacdc:Previous Bank" Location="193,22" Name="DownArrow" OnPress="Parent.Parent.Refresh_ButtonLabels.Activated=true" ScrollExtent="10,10" Size="10,10" Style="/ProfitUI_Styles.ButtonStyles.BankSelector_down" Tooltip=":b7d61af6404eacdc:Previous Bank">Up</Button>
<Button AbsorbsInput="false" LocalText="Dn" LocalTooltip=":b7d61af6b99ebb95:Next Bank" Location="193,0" Name="UpArrow" OnPress="Parent.Parent.Refresh_ButtonLabels.Activated=true" ScrollExtent="10,10" Size="10,10" Style="/ProfitUI_Styles.ButtonStyles.BankSelector_up" Tooltip=":b7d61af6b99ebb95:Next Bank">Dn</Button>
</Page>
<Button Name="BankPageToggle" OnHoverIn="Parent.BankPage.Visible=true" OnHoverOut="Parent.BankPage.Visible=false" Opacity="0.000" PackLocation="nfn,cfc" PackLocationProp="0000/0001,0000/0001" PackSize="f,p" PackSizeProp="0002/0003,0032/0032" ScrollExtent="14,32" Size="14,32" />
<Page Location="12,0" Name="IconPage" PackSize="a,a" PackSizeProp="0012/0001,0000/0001" ScrollExtent="384,32" Size="384,32">
<Image Activated="true" GetsInput="true" LocalTooltip="Move/Access right-click menu here" Location="372,20" Name="MoveButton" OnHoverIn="Parent.Parent.UserResizable=false" OnHoverOut="Parent.Parent.UserResizable=true" PackLocation="right,bottom" PackLocationProp="-012/0001,-012/0001" ScrollExtent="12,12" Size="12,12" SourceRect="122,476,136,490" SourceResource="/images/window_elements_generic.dds" Tooltip="Move/Access right-click menu here" UserScrollable="false" Visible="false"/>
<IconBank Dragable="true" Font="/ProfitUI_Styles.Fonts.FontArial13T" FrameColor="#B5B5B5" IconFramePadding="0" IconPadding="0" IconStyle="/IconStyles.button" Name="Icons" PackSize="a,a" PackSizeProp="0000/0001,0000/0001" RenderFrame="true" RenderOutlines="true" ScrollExtent="384,32" Size="384,32" TextColor="#FFFFFF" TextMargin="2,-1,2,-2" TreatAsButton="true"/>
</Page>
<Page AbsorbsInput="false" BackgroundOpacity="1.000" Enabled="false" GetsInput="false" Name="WC_Backdrop" PackSize="p,p" PackSizeProp="0396/0396,0032/0032" ScrollExtent="396,32" Size="396,32"/>
<Page Name="WC_Frame" OnHide="Parent.BankPageToggle.Visible=true" OnShow="Parent.BankPageToggle.Visible=false" PackSize="a,a" PackSizeProp="0000/0001,0000/0001" ScrollExtent="396,32" Size="396,32" Visible="false"/>
<Page Location="4000,4000" Name="VerticalSizeOf40ResizeBugAndOnShowNotWorkingOnNewHotbarOpenBugWorkaround" PackSize="a,a" ScrollExtent="384,32" Size="384,32">
<Page Name="RealHotkeySize" PackSize="a,a" ScrollExtent="396,32" Size="396,32"/>
</Page>
</Page>

There is almost certainly a more elegant solution but I'm way too tired right now to even consider thinking about it.

PS: Didn't run into your problems under 2), likely because my window uses a number of workarounds around the hardcoding already...