Just chiming in with a "me too".
One of my clients has an excessive collection of quarterly reports that, under normal circumstances, takes about 10-12 hours to run. It's all done with some very simple VBA, but since it's spitting out 100s of PDFs, it takes a while.
We've been doing this quarterly without any hiccup for well over two years. Our setup is an ACCDE front-end (32-bit) with a MS SQL backend over ODBC.
When we attempted to run the report a few days ago, we couldn't get past the second PDF. A variety of "System Resource" type errors would pop up and Access would have to be force-quit. When watching the Task Manager, I can see Access's memory jumped roughly 5 MB every second until it would hit about 1,000 MB, then it would crash.
After updating to 64-bit office, we have the same problem but now it goes up to 5,000 MB after running for about 10 minutes. I force quit because I knew it would soon reach the limit of RAM on the machine.
It definitely appears that there's some kind of memory issue for intensive queries that causes Access (or the SQL driver, I don't know) to not reclaim the RAM after it's done using it.
I've since tried optimizing the queries, shifting queries to the SQL server, editing the reports to a minimum, rebooting, editing code for undefined/varient data types, compiling/recompiling VBA, even copying all of the Access objects into a new ACCDB file, and nothing has any effect. I've also tried reverting to an old version of the ACCDB file from September (in case it was a mistake I made), and nothing solves the problem.
Needless to say, I've spent about 5 hours troubleshooting this and my client still doesn't have their quarterly reports.