Thanks for your post...The cisco sales engineer just replied me that this issue in version 5.2(1)N1(1a) is a bug.It aleadly fiexed in the lastest version .5.2x and 6.0 version. You said right the only way to fix it in this version is reboot the switc...

I'm having the same problem now.I do the config-t configration on my one N5K device.and then whatever I do on my device ,It always say "Error: Session Database already locked, Verify/Commit in Progress." I tried a lot  to fix it ,but it does't work.N...