A few minutes ago out of knowhere the activate command has quit working for me in assemblies. It doesn't seem to matter how or when I use it, from within a command, by right clicking the part I'm wanting to activate, or by selecting activate from the home tab without any other command active, it just will not activate any parts for me. The only way I've managed to get them active is by editing the part in place, then backing out of it and the part will then be active. Here's a video showing this behavior, never posted a vid here before, hope it works. I'm currently running ST8 mp8 on windows 7.
In general, I have to reboot about every 3 or 4 hours of Solid edge use. Once the VId card runs out of memory because of memory leaks in the Nvidia drivers, the vid card runs out of gas. At that point many functions inside SE stop working, at least graphically.