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The fact that the background wash is not being redrawn is usually a driver problem, but can also be caused by running out of video RAM.
The second problem could be caused by some higher-priority program taking control and ending the Aquarium. This used to happen a lot with network software when a new message came in, but I haven't heard much about that in a few years. Of course, this is assuming that you do not have "Exit on Mouse Move" checkmarked, and the system is simply getting a mouse signal (wireless and optical mice are especially prone to sending random signals).
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