So ye 'ave exported the preset and all that, yes? If not, that may be apart of the problem. Make sure ye go to the preset maker and export it {don't forget to put y'er username in the log in box so it knows to export the preset to y'er account.}
If ye 'ave already done this, does the preset work in the preset maker? Can ye see it on the preset character when ye load it? If not, and it crashes or 'tis just not visible, then 'twould most likely be a coding error found in y'er preset material file. Make sure each file is listed correctly in this material file. If the file is listed as preset_body8.jpg but is really a png file, change that to the correct file name or else it won't show up.
If ye 'ave no errors in the material file, it could very well be the preset files themselves. Make sure that all files are the correct size and 'ave only one of each. Copies of the same file may mess up the preset.
If none of the above fix y'er issue, just let me know and I shall look into it further. Best of luck to ye floof!