Just updated IntelliJ to 2018.3 and Cursive to v1.8.0-2018.3, tried opening a Deps project and got this in the Build window: Sync finish event has not been received. Looking at the IntelliJ logs, I see the exception:

2018-12-02 15:56:44,531 [ 466761]   WARN - nal.AbstractExternalSystemTask - clojure/java/api/Clojure 
java.lang.NoClassDefFoundError: clojure/java/api/Clojure
	at cursive.deps.ToolsDepsResolver.resolve(ToolsDepsResolver.kt:22)
	at cursive.deps.DepsProjectResolver.resolveProjectInfo(DepsSupport.kt:292)
	at cursive.deps.DepsProjectResolver.resolveProjectInfo(DepsSupport.kt:259)
	at com.intellij.openapi.externalSystem.service.remote.RemoteExternalSystemProjectResolverImpl.a(RemoteExternalSystemProjectResolverImpl.java:37)
	at com.intellij.openapi.externalSystem.service.remote.AbstractRemoteExternalSystemService.execute(AbstractRemoteExternalSystemService.java:58)
	at com.intellij.openapi.externalSystem.service.remote.RemoteExternalSystemProjectResolverImpl.resolveProjectInfo(RemoteExternalSystemProjectResolverImpl.java:37)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.intellij.openapi.externalSystem.service.RemoteExternalSystemFacadeImpl$1.invoke(RemoteExternalSystemFacadeImpl.java:115)
	at com.sun.proxy.$Proxy3.resolveProjectInfo(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:346)
	at sun.rmi.transport.Transport$1.run(Transport.java:200)
	at sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
	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)