Problem with not responding import dialog

Try disconnecting the network drives, see https://youtrack.jetbrains.com/issue/IDEA-56075 .

I don't have a network drives.
Attached automatick thread dumps after dialog is freeze.

It can be a problem associated with the version of java jdk(1.8.0_60 (x64)) or x64 bit system?

According to the dump it's traversing the file system and is getting information about files:

"ApplicationImpl pooled thread 4" prio=0 tid=0x0 nid=0x0 runnable
     java.lang.Thread.State: RUNNABLE
(in native)
 at com.intellij.openapi.util.io.win32.IdeaWin32.getInfo0(Native Method)
 at com.intellij.openapi.util.io.win32.IdeaWin32.getInfo(IdeaWin32.java:82)
 at com.intellij.openapi.util.io.FileSystemUtil$IdeaWin32MediatorImpl.getAttributes(FileSystemUtil.java:365)
 at com.intellij.openapi.util.io.FileSystemUtil.getAttributes(FileSystemUtil.java:119)
 at com.intellij.openapi.vfs.impl.local.LocalFileSystemBase.getAttributes(LocalFileSystemBase.java:799)
 at com.intellij.openapi.vfs.newvfs.persistent.PersistentFSImpl.findRoot(PersistentFSImpl.java:892)
 at com.intellij.openapi.vfs.newvfs.persistent.PersistentFSImpl.findRoot(PersistentFSImpl.java:56)
 at com.intellij.openapi.vfs.newvfs.VfsImplUtil.prepare(VfsImplUtil.java:160)
 at com.intellij.openapi.vfs.newvfs.VfsImplUtil.findFileByPath(VfsImplUtil.java:60)
 at com.intellij.openapi.vfs.impl.local.LocalFileSystemBase.findFileByPath(LocalFileSystemBase.java:62)
 at com.intellij.openapi.fileChooser.ex.RootFileElement.getFileSystemRoots(RootFileElement.java:65)
 at com.intellij.openapi.fileChooser.ex.RootFileElement.getChildren(RootFileElement.java:44)
 at com.intellij.openapi.fileChooser.impl.FileTreeStructure.getChildElements(FileTreeStructure.java:85)
 at com.intellij.ide.util.treeView.AbstractTreeUi$32.perform(AbstractTreeUi.java:1624)
 at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:33)
 at com.intellij.ide.util.treeView.AbstractTreeUi.execute(AbstractTreeUi.java:1830)
 at com.intellij.ide.util.treeView.AbstractTreeUi.getChildrenFor(AbstractTreeUi.java:1621)
 at com.intellij.ide.util.treeView.AbstractTreeUi.access$4700(AbstractTreeUi.java:62)
 at com.intellij.ide.util.treeView.AbstractTreeUi$47.perform(AbstractTreeUi.java:2708)
 at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:33)
 at com.intellij.ide.util.treeView.AbstractTreeUi.execute(AbstractTreeUi.java:1830)
 at com.intellij.ide.util.treeView.AbstractTreeUi.access$2500(AbstractTreeUi.java:62)
 at com.intellij.ide.util.treeView.AbstractTreeUi$58$1.perform(AbstractTreeUi.java:3386)
 at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:33)
 at com.intellij.ide.util.treeView.AbstractTreeBuilder$4.perform(AbstractTreeBuilder.java:467)
 at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:33)
 at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:872)
 at com.intellij.ide.util.treeView.AbstractTreeBuilder.runBackgroundLoading(AbstractTreeBuilder.java:464)
 at com.intellij.ide.util.treeView.AbstractTreeUi$58.perform(AbstractTreeUi.java:3377)
 at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:33)
 at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:152)
 at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:452)
 at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:402)
 at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
 at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:137)
 at com.intellij.ide.util.treeView.AbstractTreeUi$59.perform(AbstractTreeUi.java:3439)
 at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:33)
 at com.intellij.util.concurrency.WorkerThread.run(WorkerThread.java:108)
 at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:400)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at java.lang.Thread.run(Thread.java:745)
 at org.jetbrains.ide.PooledThreadExecutor$1$1.run(PooledThreadExecutor.java:56)

For some reason it takes a lot of time for your file system.

Could be caused by an antivirus or junctions.

Thank you for help. Check my hdd and it start works.