I know someone posted about this the other day and I was having problems with it on 5.0 so I thought I would mention, winterboard now has an update. It looks like its working great on 5.0 and it actually installed and th theme I wanted without causing my phone to go into safe mode, just thought I would share.
Winterboard Update!
- Thread starter TheJustPull
- Start date
Thanks for the update. If only the untethered JB was out. The tethered JB was causing me a lot of issues. 
I haven't had many issues with it, many try doing the whole process again? The only problem i've had is a few safe mode springs but a re-spring fixed them.