Works!
Thanks for the fix, been look for one for a long time!
I have the same issue, and i have had for a while.
Ive seen some where that its only an issue on a windows system, but havent testet it for myself.
I tryed version 2.0.0, and it dosnt have this issue.
BTW: i just found this, havent tryed it yet, but going to asap..
http://ww.wp.xz.cn/support/topic/plugin-advanced-custom-fields-fix-fields-disappearing-after-clicking-save-field?replies=1
The Fix Works :D!! just tryed it, i can now save my fields.. yay.!