Well, I just tested all y'er coding, and it appears just fine on m'screen. What it could be is a misplaced file or perhaps a corrupted one. 'Ave ye messed with any of the files located in the Models folder? 'Tis where, I believe, the mane files are located.
'Tis it just a certain mane ye are clicking on, or 'ave ye tried the other manes? M'manes were working just fine with the coding ye provided and I 'ave not found any typos in there, as of yet.
Any new mods ye downloaded, by chance? Although 'tis a far stretch, a mod could 'ave tampered with the FH files to cause this crash.