I've also answered via mail
Open the info.plist with editor and change the following line
<string>-Xms64m</string><!-- I4J_INSERT_VMOPTIONS -->
to
<string>-Xmx1g -XX:MaxPermSize=256m</string><!-- I4J_INSERT_VMOPTIONS -->
and start JDownloader and check if that helps
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JD-Dev & Server-Admin
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