I am not sure if this is the best place to share it but I have just observed this on my machine. I am using SW2010 SP5.0 on a x86 machine with Win Vista.
- Run SolidWorks
- Open a part/ assy/ Drawing
- Open TaskManager
- Goto SolidWorks Window and click Tools-> Addin
You shall find that the SolidWorks process suddenly looses all memory in the task manager. If you close Addin form, SW process shall start picking up memory again.
Let me know if you find the same.