The guru meditation errors came up on Intel CPUs without unrestricted execution support. Unrestricted execution in VT-x requires nested paging but is not available on all Intel processors which support nested paging. The Core i7 Q 740 in comment 12 is one example of such a CPU. This will be fixed in the next major release.
There will be additional fix to get reasonable NetWare guest performance without nested paging. That problem is caused by the fact that for some reason NetWare does not enable the CR0.WP bit, which is extremely unusual for an OS which requires any 486 and later CPU and causes problems with shadow paging.
