what are the problems with viewstate?

. In some cases, this view state can get large and be a potential source of problems. Some browsers cannot handle such a large hidden field (and the resulting large request), and the browsers may truncate the view state. Truncating the view state causes a view state corrupted error message. This behavior is most likely to occur in simpler browsers. For example, this behavior may occur in a browser on a PDA.

To determine whether you may be running into such an issue, try storing the view state in the session.