Hi Juliano,
You want to get Font Book off your system. Once its database gets corrupted (and that happens easily, and often), fonts simply stop working as expected. To get Font Book off your hard drive, follow these steps:
1) Open Font Book, and then its preferences. Uncheck the box for "Alert me if system fonts change". Close the preferences and shut down Font Book. Put the Font Book application in the trash and delete it.
2) Restart your Mac and immediately hold down the Shift key when you hear the startup chime to boot into Safe Mode. Keep holding it until OS X asks you to log in (you will get this screen on a Safe Mode boot even if your Mac is set to automatically log in). Let the Mac finish booting to the desktop and then restart normally.
This will reset Font Book's database and clear the cache files in your user account. Any font sets you have created will be gone. Also, all fonts in the three main Fonts folders (System, Library, your user account) will now be active, regardless of their state beforehand.
The main goal in this step is to remove the orphaned Font Book database from the hard drive. With the Font Book application no longer on the hard drive, a new one cannot be created. Which is what we want.
3) Close
all running applications. From an administrator account, open the Terminal app and enter the following command. You can also copy/paste it from here into the Terminal window:
sudo atsutil databases -remove
This removes all font cache files. Both for the system and all user font cache files. After running the command, close Terminal and
immediately restart your Mac.
At this point, all fonts should be active and working. Now start trying the various font manager replacements you're considering. My personal choice is Suitcase Fusion 3. It takes "the font from Hades" to make it stall or crash. I've only ever had ONE font manage to do that. And that was on a purchased CD of fonts, no less!
I can't say enough good about activating fonts in place, which both Suitcase and FontExplorer X Pro can do. I mention this to lead into Bee's personal favorite, FontAgent Pro. It is also a rock solid piece of software that works very well. But, it has one drawback that can cause a very expensive disaster. Any fonts you activate with FAP (it has no option to activate in place), it copies the fonts to a separate location in your user account and then handles them from there. Now say you have three separate folders of fonts for various projects and each has one font which is identical. You open those fonts as three separate sets in FAP. What FAP then does is copy only the first version of that identical font to its storage folder and uses the same font for all three sets.
This sounds logical and efficient. It's not. You may modify that font, or a client will send you a modified version of that same font, usually without telling you it's been altered. Now if you, or they didn't give the altered font a new name and you add it to FAP, it will NOT be copied to the storage folder or even be used! FAP will activate the font already there by that name. If that gets all the way through to press, and your client doesn't notice until then that the kerning, or whatever they changed is not present in the text,
you will be caught with a very expensive bill to reprint the project.
How often would something like this happen? Probably pretty rarely. But if they're printing 25,000 copies of something, the replacement paper cost alone could set you back several thousand dollars. It's just something to be aware of about FAP.
FontExplorer X Pro is reportedly still having some minor issues in Snow Leopard. Namely in the occasional font(s) that just won't activate for whatever reason. Linotype has gotten that issue mostly worked out (used to be a bit more frequent), but it's still showing up now and then. That may be more of a problem with corrupt font caches causing the issue than FEX itself. Auto activation is also still spotty.
I honestly can't find a fault with Suitcase. A really crappy font may hose its database (which it uses whether or not you're activating fonts in place), but is easily fixed by creating a new one from its panel in the System Preferences. Suitcase reportedly has the most reliable auto activation, but I can't vouch for that as I don't trust auto activation, no matter whos software it is. I keep the fonts for each project in a folder within that project and then create a set for it in Suitcase. When I want the fonts for that project on, I turn them on. Then I
know I'm using the correct fonts.