something went wrong, since you have updated the plugin.
I have deleted it from my FTP and re-installed it anew, so that I can ensure, that I have the latest version.
But then I get this message:
My Twitter Widget
Du hast Version 1.3.8 installiert. Aktualisiere auf Version 1.5.7. Zeige Details von Version 1.5.7.
Kompatibilität mit WordPress 3.5.1: unbekannt
"You have installed version 1.3.8. Update to version 1.5.7 ..."
But I DO have installed the version 1.5.7 - I have just got it from the rep here, and the update warning comes all the time. No, I don't use a caching!