I have a multiuser Access 2000 application. Most of the time it runs with no problems. Occasionally, and it seems very randomly, a user will get the messaage "You can't carry out this action at this time." When this happens, you cannot proceed with anything. In fact, you have to use Task Manager to exit the program. We're using an Access mde frontend that is loaded on each individual workstation running the Access 2000 runtime and an Access backend on a Windows 2003 domain server. There are usually other nonAccess programs running concurrently on the workstations. Each user runs his/her own mde locally and does not share resources located on other workstations. They only share the database on the server. I can't duplicate the problem on the workstation I use for development. I have experienced some problems with conflicts between different Access libraries on the workstations before and have resolved them (mostly with help from this forum I must say). Does this sound like something along those lines? Thanks.