Real work allocations not saved

Hi,

Just saw a strange issue: I have one user who is unable to save his real work allocations... (only one user!)
He can enter his inputs, but when clicking save, the "spinning wheel" of Chrome turns endlessly, the data is not saved, and the application needs to be forcefully exited in order to regain control.

I also tried entering the data as admin for this resource, but with the same result.

I have no error in the logs, just the spinning wheel... Any ideas on how to tackle this ?

Regards