@Thomas Phinney @Adam Twardoch and other typeface designer colleague.
I hope folks you will be able to help me. I had to change my Mac G5 last week (2004 machine). I switch to a iMac High Sierra 10.13.3. I woke up this morning with a big bad news, Fontlab 5 doesn't work any more. I'm in a big trouble. I actually work on typeface for a client and I had to finished within the next two weeks. I know the version 6 work, but I'm not ready to buy at this time and more over I don't have time to learn FL6

. Probably I will move to FL6 within the next month. As I read on some forum, I've updated to the 5.1.5 with the hope this will solve my problem without any good result though. I can't launched Fontlab any more. I really need your help. Thanks in advance.
Comments
Try deleting your preferences and workspaces (save copies first).
If that doesn't work, try reinstalling the application.
André
Also, if you haven't done so, contact FontLab support. They likely have a solution.
I haven't found anything I need to do which can't be done, but certain operations become much more tedious. I’m hoping they’ll eventually fix this, though with FontLab VI already out I suspect it's not a high priority.
While FontLab VI offers many advantages over FontLab 5, I still much prefer the FL5 interface so I’m sticking with it for the time being.
Short answer: I’m not aware of a general workaround for the clipboard bug, but it’s still possible to use FL5 in spite of it. I should note though that I generally work with single masters. This bug might create problems for multiple master design that I am not aware of.
André
André
I delete all about FL first and I already uninstalled / reinstalled. Nothing change still not able to launched.
What actually happens when you launch it? Do you get an error message? Does it hang? Does it open and then immediately close?
Have you tried booting in safe mode to rule out software incompatibilities?
Georg Seifert’s suggestion of running in a VM is certainly viable, but it shouldn’t be necessary (though having VMs of earlier systems hanging around is extremely useful).
André
The problem André faced is due to a problem specific of FontLab 5.1.5 in macOS: you need to run it once in an English environment to get the app correctly set up. This is easily achieved changing the system first language and restarting the Mac. After a first run, you can go back to your original language and FontLab Studio 5 will work normally.
Our knowledge base has an article about that.