Error while applying patch: Failed to change binary file: (Access is denied)

Hi

We are on the latest version of TC 10 as of writing this.

Suddenly our builds have stopped working, working fine suddenly not, no config changes. The agents are running Windows Server 2012R2.

Have checked permissions and it all looks fine just fine. Anti Virus software was disabled and still the same. Tried server side checkouts and still the same error.

Done the obvious like rebooting agents and manually deleting the work folder.

This is in the logs (redacted some file names):

[Updating sources] Failed to perform checkout on agent: '"C:\Program Files\Git\bin\git.exe" checkout -q -f Release2016.5' command failed. exit code: 1 stderr: error: unable to create file Toms.Net.Admin/Toms.Net.Admin/Synchronizers/Implementations/GVIM Instructions.txt: Permission denied error: unable to create file ucInstructionTip.Designer.cs: Permission denied error: unable to create file ucInstructionTip.cs: Permission denied error: unable to create file Controls/ucInstructionTip.resx: Permission denied

Any help appreciated.

Regards