I have a Solaris system hosting nfs shares. it created my user account in the 100's range and had been working normally for some time.
I have a Gentoo web-server that has no issues creating files/folders on the nfs share.
After upgrading my Ubuntu to 12.04 it made my user account in the 1000's and no longer matches the other systems.
I have a series of folders that are used by the web-server to upload content the folders/files are permissioned 775 user:guid 81:1005 apache:contentadm.
I have created a contentadm group on all 3 machines with the same guid and added my account on all 3 machines to that group. the Gentoo box has no issues since it is the file owner. I run a script nightly to update all files/folders permissions as specified above. I use nfs3 so that the uid/guid is kept.
With the same nfs permissions as before my user account no longer has ability to modify content. root on the ubuntu box does not have rename permissions through nautilus. If I load a term window as root I can rename by hand just fine.
From a term if I use my account and try to access the nfs share even though it has the same permissions as above my user account gets access denied.