Sounds like that other guy fiddled with the Windows settings in some way. Can you choose "run as administrator" when you launch FM and see if that works?
Have been back to the client again and done more tests. Following your suggestion, Wim, I've tried opening the system with the full access account but there was no change. The import folder window can still only see the current user's computer only. The other tests I've done are:
• Have tried on other PCs in the office - no change.
• Have tried in other files - no change.
• Have used the client's file in my own office and it works OK.
That seems to rule out the file as the culprit. And as the full network and attached drives can be seen in Windows Explorer and iTunes, it seems it's just FileMaker's import folder process that can't see them. That it's across all PCs in that office would seem to rule out reinstalling FMP on this particular user's PC. But if it's a PC setting, how can it affect FileMaker but not Windows Explorer and iTunes? I've asked them to call in their IT support but, if it's just a FileMaker issue (which they know nothing about), I don't think they'll find anything.
I'm scratching around now, with no resolution in sight. Does anyone have any other suggestions?
Following your suggestion, Wim, I've tried opening the system with the full access account
That's not what I meant. I meant telling Windows to run FMP as an administrator. It's an option when you right-click on the FMP icon.