Hi

There is an execution log in the ReportServer DB for SRS.

The execution log can tell you if the report run for that user has completed successfully before - or it may give you the error that is being experienced.

What I usually do is let the user run the report on a terminal session or on a machine under their profile which works for other users.

It may be browser settings - this will have to be investigated by comparing 1 that works versus this client session.

Let us know how this works out

Thanks

Kevin