Well, I tried running FH on Parallels Desktop, which is basically a Windows "emulator".
It made no difference...
And we recently got a new router and modem, and it is very strong. So I would check off the Internet issues.
I never flip through tabs, and normally have Safari or Finder always open when I run FH
I have looked in the FH folder, there are no duplicate/residue files.
I have Tearless wolf textures, Girlys Update II Items, a mesh pack for claws, Aug22 Markings, and Eye textures.
Also Turtle Emotes and a few others.
I had all of the above installed in the old FH, and it worked absolutely perfect.
So I wouldn't be concerned about the files I have installed.
And my computer (Mac OS X El Capitan) can run high-graphic software pretty easy. I have several other programs that require high graphic levels, and they do not crash.
And lastly, I recently reinstalled the game because of the same issues, so i wouldn't say corrupted files. But the part on the feline black head did freak me out.