DBISAM 4.31 Build 3 is now available for download. If you're an existing customer, then you should be receiving an email shortly with download instructions. This build contains bug fixes for several incident reports, which are detailed here.
In general, this build corrects an issue with the way that the Delphi XE2 64-bit version of DBISAM was built. There was a problem with the compiler defines that was causing 32-bit code to be included in the 64-bit builds.