It is yet obvious that once WordPress 3.9 was launched there might have been complaints and problems for sure and hence the WordPress team was quick to respond and a maintenance release was launched.
It is said that over 34 bugs were solved from WordPress 3.9 in this version.
In case you were facing any troubles on your WordPress of late due to 3.9 update we recommend you to update your WordPress version to 3.9.1.