Sometimes the macro window show up with the wrong size, hiding data and buttons and making it unusable. See screenshots for examples of the problem. The problem occurs with all three of the equation, expand and config windows on an empty text file in writer as well as on an empty presentation in Impress.
The screenshots are for writer only, but it happens in Impress as well.
This problem occurs on Ubuntu 8.04 with OOo 2.4 with a System 76 pangolin laptop. I have a desktop using the same versions of Ubuntu and OOo that does not exhibit the problem.
The problem is also erratic. Sometimes the window may display right for no apparent reason, but this does not happen often.