2 users on imac

I have placed the lightroom catalogue and the preview file on the shared users folder. The files are on an external thunderbolt drive. Now I am able to open photos on both user accounts on the imac.
But when I open lightroom on one account, I can't use the develop module. I get an error message "File access was denied".
I hope someone can help med sort this out.

Kruppe-
Are you trying to use the catalog on both macs at the same time? That would definitely not work. When you open the catalog on one mac, it reserves the file for that mac only - you can "open" it for viewing on the other mac but it will be read only. When you close LR on the first machine, you should wait for the LR cat to update and then open it on the second machine.
If this is your problem, I don't know how to work around it. And to tell the truth, I may be a bit off but I don't think so. I use LR on two macs (both the same account) but I keep the cat file in dropbox, so it may work a little bit differently for me.
If the second mac works when you quit LR on the first, the only solution I can think of would be to duplicate the cat and preview files for each machine...this sounds dangerous though as it would be very difficult to keep them in proper sync - so if you do that, make a backup every time you use the files.
Good luck
Tom

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