hey,

running a command like /perm user ... set ... multiple times without a delay makes only one command work.
This issue was fixed before but seems to be back now.

Seems unlikely - I haven't changed any of that logic since fixing it.

This shows up in the log after running 3 commands:

2016-12-23 22:22:34 | [LP] jackalots already has this permission!
2016-12-23 22:22:34 | [LP] Set some.permission to true for jackalots.
2016-12-23 22:22:34 | [LP] Permissions data could not be loaded. Please contact an administrator.
2016-12-23 22:22:34 | [LP] Permissions data could not be loaded. Please contact an administrator.
2016-12-23 22:22:34 | [LP] (User data was saved to storage)

Which platform / datastore.

MySQL

Which platform?

Spigot 1.10

Ok thanks - I'll look into it.

Oh, also, just to confirm, which version of LP were you running on that instance?

You're running an old build which doesn't contain the fix for this issue.

Update to latest: https://ci.lucko.me/job/LuckPerms/