Animation Problem

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Imagen de noelblakley212
I have just noticed that some animations that I do using impress have now got some very bad looking black areas associated with them. For example when I have an arrow appear on a slide with a mouse-click the arrow draws and there is a black box at the end of the arrow, obscuring what is underneath it. These slides worked absolutely perfectly last year but now are show this behavior on *both* of my laptops. Last year I was using OO 3.3 but have since switched to AOO 3.41.I have had a look around for something like this and found something about /Tools/Options/View and turning off hardware acceleration. In my version of this the hardware acceleration option is greyed out.Are there perhaps any other solutions to this problem? This is a bit of an emergency as I have a lecture to give on Friday morning and need to begin using the slides then. Any help at all is much appreciated.
Please help.
I didn't find the right solution from the Internet.