Sheet Format/Size Dialog Box Problem

When starting a new drawing the Sheet Format/Size Dialog Box is shown (every time like it should be) and the "Custom Sheet Size" option is selected. I have to select "Standarad Sheet Size" and uncheck "only show standard formats". This only happens the first time after starting SolidWorks. After changing the seettings they stay how I set them, untill i close SolidWorks and reopen. We have just upgraded to SW2010 sp2.1. This was never an issue in 2009, the options were always "Standard Sheet Size".

Could someone tell me how to set this so "Standard Sheet Size" is always selected.

Thanks

SolidworksDrawings And Detailing