Major maybe caused to the fact that I'm in development mode, in this case we can transform it from bug to enhancement request.
I hit Ctrl+4 and then the UI is blocked:
I have this stack in logs
Dec 14, 2016 6:03:24 PM org.jboss.forge.furnace.impl.FurnaceImpl start SEVERE: Error occurred. java.lang.RuntimeException: Could not create Addon Directory [C:\Data\TP\org.fusesource.ide.targetplatform.target.repo-Neon-WithSAP\plugins\org.jboss.tools.forge.runtime_2.0.102.v20161124-1441.jar\addon-repository] at org.jboss.forge.furnace.impl.addons.AbstractFileSystemAddonRepository$1.call(AbstractFileSystemAddonRepository.java:50) at org.jboss.forge.furnace.impl.addons.AbstractFileSystemAddonRepository$1.call(AbstractFileSystemAddonRepository.java:42) at org.jboss.forge.furnace.impl.lock.LockManagerImpl.performLocked(LockManagerImpl.java:55) at org.jboss.forge.furnace.impl.addons.AbstractFileSystemAddonRepository.getRootDirectory(AbstractFileSystemAddonRepository.java:41) at org.jboss.forge.furnace.impl.addons.AddonRepositoryStateStrategyImpl$3.call(AddonRepositoryStateStrategyImpl.java:137) at org.jboss.forge.furnace.impl.addons.AddonRepositoryStateStrategyImpl$3.call(AddonRepositoryStateStrategyImpl.java:133) at org.jboss.forge.furnace.impl.lock.LockManagerImpl.performLocked(LockManagerImpl.java:55) at org.jboss.forge.furnace.impl.addons.AddonRepositoryStateStrategyImpl.getRepositoryRegistryFile(AddonRepositoryStateStrategyImpl.java:132) at org.jboss.forge.furnace.impl.addons.AddonRepositoryStateStrategyImpl.access$000(AddonRepositoryStateStrategyImpl.java:39) at org.jboss.forge.furnace.impl.addons.AddonRepositoryStateStrategyImpl$7.call(AddonRepositoryStateStrategyImpl.java:224) at org.jboss.forge.furnace.impl.addons.AddonRepositoryStateStrategyImpl$7.call(AddonRepositoryStateStrategyImpl.java:219) at org.jboss.forge.furnace.impl.lock.LockManagerImpl.performLocked(LockManagerImpl.java:55) at org.jboss.forge.furnace.impl.addons.AddonRepositoryStateStrategyImpl.listAll(AddonRepositoryStateStrategyImpl.java:218) at org.jboss.forge.furnace.impl.addons.AddonRepositoryImpl.listAll(AddonRepositoryImpl.java:146) at org.jboss.forge.furnace.impl.addons.ImmutableAddonRepository.listAll(ImmutableAddonRepository.java:81) at org.jboss.forge.furnace.impl.graph.CompleteAddonGraph.getAllEnabledAddonsInAllRepositories(CompleteAddonGraph.java:92) at org.jboss.forge.furnace.impl.graph.CompleteAddonGraph.<init>(CompleteAddonGraph.java:37) at org.jboss.forge.furnace.impl.addons.AddonLifecycleManager$4.call(AddonLifecycleManager.java:218) at org.jboss.forge.furnace.impl.addons.AddonLifecycleManager$4.call(AddonLifecycleManager.java:205) at org.jboss.forge.furnace.impl.lock.LockManagerImpl.performLocked(LockManagerImpl.java:55) at org.jboss.forge.furnace.impl.addons.AddonLifecycleManager.forceUpdate(AddonLifecycleManager.java:204) at org.jboss.forge.furnace.impl.FurnaceImpl$3.call(FurnaceImpl.java:347) at org.jboss.forge.furnace.impl.FurnaceImpl$3.call(FurnaceImpl.java:329) at org.jboss.forge.furnace.impl.lock.LockManagerImpl.performLocked(LockManagerImpl.java:55) at org.jboss.forge.furnace.impl.FurnaceImpl.getAddonRegistry(FurnaceImpl.java:328) at org.jboss.forge.furnace.impl.FurnaceImpl.start(FurnaceImpl.java:224) at org.jboss.forge.furnace.impl.FurnaceImpl$1$1.run(FurnaceImpl.java:186)
