I'm sorry you are having that problem indira and Matt. I am not even running v5 yet, so not sure if I can help. I am thinking about it though. Of course, let me/us know if you fix it.
Matt, in general, error would come from the main computer, but even though I don't know the answer of .24 vs .26, personally I think it is always a good idea to have all the clients running the save version. For reasons just like this. Why do you not have them all updated? Is it a time issue?
Given that the meds.mdf and meds.ldf remain constant, why not move the meds.mdf and the mds.ldf from one of the clients to the main computer. You should turn off the server and/or detach the databases on the main computer first. Just an idea.