If you add a browser->log action in each loop I'm sure you'll see that it is repeating.
What's happening here is you're doing the same thing 10 times at the same time, so it won't look like it's repeating.
Not 100% sure what you're trying to do here; are there 10 Talking objects - each with a unique frame - that flashes? If so, you need to pick each one according to loopindex.
If you're trying to have the same object flash 10 times, you need to add a Wait action at the top of the loop. Wait loopindex*10 seconds or whatever works.
For a bit more control, you might want to add a Timer behaviour to the object.