Bukkit

Describe to us the issue that you're having:

I was testing the exec command for buycraft (switching from PEX to bPerms) and I tried the following command

/exec u:ahellhound a:setgroup v:vip

now I tried it once, and the plugin didn't save the user data anywhere (I checked all the user files). Then, I reloaded the server, and I was placed back at my default group. After trying a second time, under the same circumstances, it worked. Then I tried changing from VIP to VIP2, and the following happened:

I then noticed that in game, I was VIP2, but there was no data saved in the user yml. It may be a configuration reload method error, not sure.

Which steps will reproduce this problem?:
1) Start server with bPerms
2) Join server as default group, no OP
3) 'use: /exec u:ahellhound a:setgroup v:vip' in console
4) Look in user yml files, find nothing (checked each world)
5) type chat ingame, have the appropriate permissions and prefix
6) reload server, talk in chat, have default group
7) same goes with restarting server
8) Did this three times, first time went wrong, second time was fine, third went wrong

Do you have an error log of what happened?
http://pastebin.com/tLxARPsa

Which version of bPermissions are you using?: (Please don't say "latest"!!!)
2.11.5

Which version of CraftBukkit?: (Please don't say "latest"!!!)
I've tried the following:
Spigot_DEV1080
Craftbukkit_DEV2852

Which OS?
Windows Server 2008

Any other information we may need (plugins, configs, etc):
Also, in the config, I set 'use-global-files' to 'true'

plugins:
http://imgur.com/Jc04qZ7

Had user file opened in Notepad++, but was NOT actively editing file

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I don't think /exec saves files automatically, so you need to also use /bp save