Setting SetTextOverlayIsVisible(true) and SetTextOverlayHoldTime() to any value (including 0) causes the SlideShow component to just spew isPlaybackPosition events while the image doesn't change (the index returned is always 0).
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With the above, the next slide will not display after 6 seconds, but will if I remove the SetTextoverlayIsVisible call. I also tried setting SetTextOverlayHoldTime, but that doesn't seem to work (the overlay stays forever) and has no effect on the SetPeriod.
I'm running version 3.0
(edit - hmm, seems like I just recreated the same problem. I should have read the original post more closely