@paulroberts: Thanks for the report. We’re unable to duplicate this issue. If anyone else arrives here and has the issue, can you please try:
*Confirming you’re java / flash components are up-to-date on your computer
*If you are willing, consider deactivating plugins to see if there’s some kind of conflict.
*If nothing else works, submit a bug reports with credentials so we can troubleshoot.
https://www.nextgen-gallery.com/report-bug/
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One note on this: The flash slideshows are generated by the JW Image Rotator, which is a separate third-party component that we just include. You used to have to download and install it separately for NG flash slideshows to work. If there’s some kind of fundamental issue with it, there may not be a lot we can do about it. So just a heads up.