Howdy, we are on SW2004 but running a 30 day trial of 2008 SP3.1 and about to buy it. Everything seems to work well except for one problem I have when running an assembly with many sub-assemblies and parts. I tried to search but only found one post about ctl-tab which didnt' answer this question. Here is what I do: 1. open up assembly 2. open up a part within an assembly 3. go back to the assembly with the window menu or ctl-tab 4. save 5. try to go back to the part with ctl-tab or window menu 6. what appears is not the part i had already opened, but another part in my assy, or a sub-assy, which I haven't opened in this session of SW. Sometimes it will open up 3 or 4 of these parts, always seems to be the same ones, and I'm wasting half of my day closing them all the time. Any help with this would be radical. ~pope