The Host Integration Server Product Team has just released the fourth Cumulative Update (CU) for HIS 2010. The cumulative update model is used to package and release product fixes on a more consistent schedule.
HIS 2010 CU4 includes fixes for HIS 2010 that were fixed after the release of HIS 2010, including all the fixes that are in the previous HIS 2010 cumulative updates. Details on the included fixes can be found in the following Knowledge Base article:
2691943 Cumulative update package 4 for Host Integration Server 2010 http://support.microsoft.com/kb/2691943
You can download HIS 2010 CU4 via the View and request hotfix downloads link in the KB article. You would need to download the CU4 package that matches the HIS 2010 version (x86 or x64) that you have installed.