I have several applications on multiple workstations running with FlexODBC drivers.  Just recently, I have upgraded our license to 4.x drivers.  I updated several of our corporate machines yesterday - and I am now experiencing some stability issues with a couple workstations.  The Access applications (which have been in place for over 5 years) are not starting to freeze up - by flashing repeatedly (about 10 times per second) and taking up all system resources from the machine.  When I end the task on the Access application - the system recovers.  I can start the application - and it may work fine for an hour - but this behavior starts up periodically.  I have since reverted back to driver 3.10.10 for 1 workstation - where this issue is most prevalent.  Can you shed any light on the matter?  The workstation in question that exibits this behavior most frequently is an un-manned unit which continually runs update routines - where it captures information for DataFlex database and populates an Access table - along with many other Access reporting routines.