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So, you can't use the 'Performance' tab of the Windows XP Task Manager to look for memory leaks (but, if you are using a special program designed to monitor WindXP memory usage, that's different).

What you can use, within Vue itself, is the resources value in the options window. I check this from time to time, and it goes relentlessly down just from ordinary actions. When it gets below 15% I have to save, quit Vue, start it again and reload the scene. Otherwise Vue crashes.

Switching off Open GL slows the rate at which resources evaporate, but the wireframe display is very hard to read, and it becomes impossible to place things accurately.