Thx ags.
I cannot find anythin suspicious here
Seems a dukascopy problem...
Meanwhile uploaded a new path with minor corrections.

EDIT: Again upload a new version which prints the current usage of heap space to track possible issues. Also added more deletions on JNI references which could fix an issue with heap space. You can now also set the maximum available heap size in the Plugin.properties file. When setting it too high, the Plugin just crashes.