Certain VM (RedHat) crashing module VBoxNetFlt if launch any other VM

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I'm using come vms, but I have one merged from VMware with RedHat inside which crashing module VBoxNetFlt if start together with any other VM. If only "problem" VM launched - it's OK. Crash accompanied with VirtualBox-Guru-Mediatation screen and after that there is no way to launch any VM (just not starting) until perform the full-reboot. Instead rebooting I've tried to reload modules VBox*, but module VBoxNetFlt cannot be unloaded with "it's using" reason (while it's not actually using). Logs and dmesg included.