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SAPGUI VU's limitation

We are hitting a limitation on the number of SAPGUI VU's (7.10 patch 19, LR 9.52) we can run on one generator. The generators have 4 processors and 12GB RAM running Windows 2003 enterprise server.

We get to around 100 VU's and then as additional VU's are initialised we start getting errors and cannot get past 85 to 100 VU's. The errors are mainly MDRV errors as VU's crash. I have tried running VU's as a process as well as a thread but this doesn't change anything. I have also tried changing the AgentMaxThreadsPerDriver=5 in wlrun7.ini but each MDRV.exe still goes to 200MB before the next one is created.
Any advice would be greatly appreciated.
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