The beta version (4.2.344) did overcome the memory leak problem, but I got another BSOD – "DRIVER_IRQL_NOT_LESS_OR_EQUAL" for tcpip.sys.
I quit NAD and my PC is running fine for the last 24 hours, so I guess we can say that NAD is triggering the BSOD.
It is, however, possible that the driver error occurs because I've patched tcpip.sys to raise the maximum half-open tcp connection limit to 50 (EventID 4226) using the patcher from http://www.lvllord.de/?url=tools
I hope this helps, and if you need me to try something else – I'd be happy to help.
I forwarded your information to the Neta Activity Diagram developer.
He will try to reproduce and fix this problem.