I too am having issues w/Ver5.2 on Win7/64 notably:
1) "My Assets" spins endlessly while returning NO Assets

2) Despite having logged-in successfully the green "Forging" indicator is NOT present and my "JNote: javascript error notifier" keeps reporting:
nrs.js
Uncaught TypeError
NRS.updateForgingStatus is not a function

Fyi - yes, I'm updated to Java Ver8 Build 66

3) With only 2 of 20 peers in my Hz Client reported on Ver 5.2 w/all but 1 of the rest on Ver 4.0e (which has, and continues to be rock-solid) I'm also staying put on Ver 4.0e for now and hopefully the issues will be resolved before the hard fork at 515000 (Thanks Altsheets for the Countdown Reminder)
https://bitcointalk.org/index.php?topic=823785.msg13004883#msg13004883