I'm running Excel 2007 on a new windows Vista Ultimate os (32 bit). I have a spreadsheet that pulls dde data from esignal. When I open the sheet and update the links, it works fine. But after I've closed it and try to re-open it, it crashes when I try to update the links. Seems I can only get 2 or 3 dde updates (same sheet, or a different one) before it no longer works. A system re-boot is the only way to get it to work again. It's not an esignal problem, because the same thing happens with dde links to other platforms as well. Anyone else experience this?