Tabbed Dock does not allow me to resize on the X axis…

Specs: Tabbed Dock - Set to show as a drawer with mouseover activation on – No Hotspots are set - Position is on the left. Vista Ultimate x64.

Problem/Reproduction steps:
Use the mouseover action to bring out the dock, select dock settings, select position, select right, then attempt to resize the dock using the mouse hovered in the lower left hand corner (on the X axis). I’m unable to do this; however, if I switch back to the left side I’m able to resize it on the X axis.

Note: I can resize it on the Y axis whenever I changed from the left or right side. Also, if after I switch the dock to the right or left side (the one where I can’t use the X resize) all I have to do it pull the dock away from the screen edge and place it back to be able to use the X axis.

This is also reproducible using the Y axis for the Top and Bottom positions.