Same here, yesterday nzbindex stops working, 0.4.7 works here before. And 3G or wifi makes no differences, also other nzb apps (sabmobile) still works...
All warnings have
WARNING: Invalid NZB file ......., skipping (reason=mismatched tag, line=25)
ERROR: Error getting url
http://www.nzbindex.nl/release/......... (cause= "")
Also a BUG since ever, if i have a server name like myserver.local and i am on 3G there is no error (timeout not works) and i am not able to switch the servers, if i used instead IP numbers like 196.168.1.2 on 3G i am able to switch is this a DNS Problem or APP bug.