Problem display table/tesxt box in reporting viewer

Hi all,
we are deploying some reports using a web application with reporting viewer. All it's working fine, but we have a strange behaviour, when the text is long and doesn't contain space between words the report shown through reporting viewer display e long line that goes outside the web page, instead of we ha a long text with space between words, the textbox grows vertically and the report remain correctly in the main page.
We are having this issue only with the reporting viewer, if I open the report directly from reporting server it works fine.
In the general settings of the test table text box we have left the default settings with "can grow" = true and "can shrink" = false
Can someone help us and give some tips on this "issue"?