User data could not be read. Surrogate &1.
&1 - Surrogate (unique identifier) of a user.
This indicates that a function needing to read the data for a specific user
was not able to read the data.
The message will usually be followed by another message specifying the context of
the error.
Check whether the message log shows a message just after this one, which explains
more about the context of the error.
You can use the "Surrogate" menu item in the administration menu to check
whether any data exist for the specified user surrogate.