Today froglogic released Squish 4.0.0 Beta 3 which incorporates fixes for the most frequently encountered problems with the second beta. Please visit https://www.froglogic.com/pg?id=Customers&category=s4beta to get access to the packages of this release.
Here is a list of the user visible fixes since Beta2: https://www.froglogic.com/download/4betanotes/#tp1-beta3-changes.
Thanks for all the feedback we’ve received so far. More is very welcome to stabilize the product for the final release, which is planned for May 2010.