We have had lots of trouble with some of our more complex Data Lists timing out.  They get the error "The operation has timed out".  There is a two minute timeout, which we've been advised by Blackbaud support is hard coded into the system.  We've previously had our timeout settings altered for address validation, from 1 minute to 30 minutes, because of a similar problem with address validation, which arose after a recent change to BB's address validation servers.  We've also had our maximum number of records displaying in a data list increased from some small value (5000?) to 100,000. These were able to be changed, by Blackbaud support, in our web.config file.  Please enable the Data List timeout to be altered using a config file as well, so that BB support can change it for our organisation.