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Created attachment 820288 [details]
anaconda crash log 1

Description of problem:
I've set up the installation as desired. Then I've accidentally clicked on the disk selection. I wanted to get back by hitting the Done button, but it didn't let me. So I've chosen the disk to install to and tried to get Done again. Now I don't exactly remember if I got the error right after that or after closing the popup window, I got distracted by the reporting procedure :-/

Version-Release number of selected component (if applicable):
19.31.32-1

How reproducible:
totally random

Steps to Reproduce:
1. mess around with disk settings (and possibly other)

Actual results:
crash, see the attachmets

Expected results:
no problems

Additional info:
if that matters, I've installed over previous install - completely removing partitioning, then autocreating disk layout, then removing /home and enlarging / to the rest of the disk

Created attachment 820289 [details]
anaconda crash log 2

I saved two reports from anaconda - after saving the first, I got the crash report again, these seem to differ a bit ... then I got crash report again, but I have chosen not to store anything else

Please retry using RHEL 7.0 Beta at least.  I have tried to recreate what you described, but there are too many questions.  If you can provide an exact reproducer and a specific error, feel free to reopen the bug.