Spark with Redfire plugin suspending after audio/video chat

Hi,

I'm using Spark 2.6.3 with latest redfire spark plugin (downloaded from redfire test page). After starting a audio/video chat, conversation goes fine, but spark client goes in suspend mode. I cannot move any spark window or close it or use any button. Only ending process from task manager helps me. Used on Windows XP, 7, 8. Any ideas?