First of all: Thanks for the reply.
I checked the original audio file, yes it was 5.070 KB.
Next, I tried it with another audio file that was only 2 MB in size. That lets me start the player, but once stopped, I could not restart it again.
After that I tried it with two different Players on a page, both with a separate ID and with mp3 around 2MB size. Same result. I could start them (despite the fact that they are running simultaniously, see my other post), stop them once, but could not restart them again.
This behaviour does not change, even if I wait several minutes.
Great plugin so far, but has some little flaws. And I really, really like the vizualisation. Perfect for my band’s page. And my two cents: 5mb is not that big for a nice mp3 file these days. At least I think so.