I created a workgroup with 3 computers several months ago. One computer shares a folder to the other two. The shared folder contains several subfolders. All was well.
Then, today I discovered that files in some (but not all) of the subfolders of the share were not accessible via the network. The folders themselves were accessible, but if I clicked on a file I got "permission denied". There didn't seem to be a pattern to the problem; files in some newer subfolders were accessible, but older ones were not. It was an "all or nothing" problem; either all files in a subfolder were accessible, or none of them were. Rebooting all the computers didn't help.
I fixed the problem by shutting down the two networked computers, and unsharing then sharing the folder again. After I rebooted the networked computers, all was well. This does seem like a heavy-handed fix, however. Does anyone know what is going on, and is there a simpler way to fix (or, preferably, to avoid) the problem in the future?