[trogggy]

Just for info...
Tried to install 3.7.4 on a nightly build.
First try was from a zip - it switched briefly to the skin when prompted, after a few seconds switched back to previous skin.
Uninstalled skin and dependencies, userdata, tried again from the repo - same result.
Tried a few times, always the same.
Cleaned again.
This time I disabled the repo, installed 3.7.3 - which loaded properly.
Then re-enabled the repo, let it update to 3.7.4 and all good.
http://xbmclogs.com/p8iffmtjm
Snippet:

15:24:18 T:5048 INFO: Error loading includes.xml file (E:\XBMC Stuff\Krypton nightly\portable_data\addons\skin.titan.kryptonbeta\1080i\IncludesDefaultskinsettings): Failed to open file (row=0, col=0)
15:24:19 T:5048 INFO: load new skin...
15:24:19 T:5048 INFO: Loading user windows, path E:\XBMC Stuff\Krypton nightly\portable_data\addons\skin.titan.kryptonbeta\1080i
15:24:20 T:5048 DEBUG: Load Skin XML: 1049.52ms
15:24:20 T:5048 INFO: initialize new skin...
15:24:20 T:5048 DEBUG: guilib: Fill viewport on change for solving rendering passes
15:24:20 T:5048 INFO: Loading skin file: Pointer.xml, load type: LOAD_ON_GUI_INIT
15:24:21 T:5048 DEBUG: CTextureBundleXBT::OpenBundle - Opened bundle E:\XBMC Stuff\Krypton nightly\portable_data\addons\skin.titan.kryptonbeta\media\Textures.xbt
15:24:21 T:5048 INFO: Loading skin file: DialogVolumeBar.xml, load type: LOAD_ON_GUI_INIT
15:24:21 T:5048 ERROR: Window Translator: Can't find window mutebug

Edit: btw the links in the first post don't point to the repo / krypton skin files. First (repo) is empty, 2nd points to jarvis skins.
Edit: had a play with 3.7.4 - looks great!