The data retrieval issues I'm experiencing sound very similar to the ones in this thread:
I'm currently using the JDBC/ODBC bridge. The errors have sporadically started since switching to 64 bit (R2008a). If there are "several known issues with connectivity and data access" when using the "JDBC/ODBC Bridge" on "64-bit systems" as per the following page, then can anyone please confirm what the known issues are, and if switching to either the pure native or pure Java adapters is likely to help with the problems I'm experiencing?