Created attachment 141197 [details] A 7zip archive with 4 PPT and ODB Lorem ipsum example presentations I had to check and use in our training process some old presentations. These had be made with LibreOffice 3.x.x and Microsoft Office Powerpoint. All of these on that time worked just fine. But now it is impossible to do the presentations as expected because presentation stops on some places and can not follow up as expected. The only way to get to the next slide is to stop presenting jump to the next slide and start again by Shift+F5. Unfortunately it happens several times and makes presenting of these presentations with LibreOffice Impress a shame for the presenters. After investigation I found that if some PNG or GIF pictures are set to use zoom animation it breaks the presentation flow. Same happens when some callout's are set to be zoomed by such animation. The problem exist with PPT presentation and also with ODP presentations. If some JPG pictures are set to be showed by a zoom animation it works perfectly. Unfortunately all LibreOffice 4.x.x may have same bug. I can not check it as I do not have so old software, but asked the guis who give me the presentations and they told me they had used them with LibreOffice 3.x.x Impress and Microsoft Office PowerPoint without any troubles. Also I have checked and can confirm that same bug is available with the last LibreOffice Version: 6.0.3.2 and LibreOffice Version: 5.4.6.2 Please see the attached here archive made by 7zip and you can see inside examples of demo presentations to see the problem by uour own.
I need to add some thing more. In the attached 7zip archive you can found the demo presentation Without_break_of_the_presentation_2-20180407.odp It works as expected, but the created from it by save as Without_break_of_the_presentation_2-20180407.ppt does not. There one of the callouts breaks the presentation flow by the Magnify animation. So I suspect this bug happens not only by zoom animation but also by the magnify and probably some other kind of animations. Probably I could not catch all situations leading to such problem and I suspect there may exist also other animations who can break the presentation flow with one or other types of animated objects.
To avoid this bug, just uncheck hardware acceleration: Tools > Options > LibreOffice > View: Use hardware acceleration Duplicate of bug 103423 *** This bug has been marked as a duplicate of bug 103423 ***
Thank you for this suggestion. Probably it need to be mentioned some where in the release notes in order to inform the users and prevent confusing situations.
I have checked and confirm that removing the check on Tools > Options > LibreOffice > View: Use hardware acceleration removes the reported problem. Let us hope some vhere in future this hardware acceleration will be fixed and this will work with this acceleration.