Dead proxy authentification popup window

Hello,

When I launch IntelliJ Idea, a popup window ask me for Proxy credentials. I enter my login and everything is fine.

But since a few week, this popup is "dead": I mean I can't enter any information in it (cursor do not appear in text fields when the popup windows has the focus) and Cancel, Ok, and Close buttons are inactive.

I try to find other child windows but it seems there is no other hidden window.

Closing IntelliJ window from the task bar is ignored. The only way out is to kill the IntelliJ process with the task manager and launch it again.

Any idea of what to do to change this anoying behavior ?

Thanks

Environnement:

IDE: IntelliJ IDEA (build #IU-183.5912.21, 26 Feb 2019 12:31)
OS: Windows 7 (6.1, amd64)
JRE: 1.8.0_152-release-1343-b28 (JetBrains s.r.o)
JVM: 25.152-b28 (OpenJDK 64-Bit Server VM)
JVM Args: -Xms128m -Xmx2048m -XX:ReservedCodeCacheSize=240m -XX:+UseConcMarkSweepGC -XX:SoftRefLRUPolicyMSPerMB=50 -ea -Dsun.io.useCanonCaches=false -Djava.net.preferIPv4Stack=true -Djdk.http.auth.tunneling.disabledSchemes="" -XX:+HeapDumpOnOutOfMemoryError -XX:-OmitStackTraceInFastThrow -Djb.vmOptionsFile=C:\Users\Sxxxxxxx\.IntelliJIdea2018.3\config\idea64.exe.vmoptions -Didea.jre.check=true -Dide.native.launcher=true -Didea.paths.selector=IntelliJIdea2018.3 -XX:ErrorFile=C:\Users\Sxxxxxxx\java_error_in_idea_%p.log -XX:HeapDumpPath=C:\Users\Sxxxxxxx\java_error_in_idea.hprof

Loaded bundled plugins: ASP (0.1), AngularJS (183.5912.21), Ant Support (1.0), Application Servers View (0.2.0), AspectJ Support (1.2), CFML Support (3.53), CSS Support (183.5912.21), CVS Integration (11), Cloud Foundry integration (1.0), CloudBees integration (1.0), CoffeeScript (183.5912.21), Copyright (8.1), Coverage (183.5912.21), Cucumber for Groovy (183.5912.21), Cucumber for Java (183.5912.21), DSM Analysis (1.0.0), Database Tools and SQL (183.5912.21), Docker integration (183.5912.21), Eclipse Integration (3.0), EditorConfig (183.5912.21), Emma (183.5912.21), Flash/Flex Support (183.5912.21), FreeMarker support (1.0), GWT Support (1.0), Geronimo Integration (1.0), Gherkin (999.999), Git Integration (8.1), GlassFish Integration (1.0), Google App Engine (1.1.4), Groovy (9.0), Guice (8.0), HTML Tools (2.0), HTTP Client (183.5912.21), Haml (183.5912.21), Heroku integration (183.5912.21), Hibernate Support (1.0), I18n for Java (183.5912.21), IDE Settings Sync (183.5912.21), IDEA CORE (183.5912.21), IntelliJ Configuration Script (183.5912.21), IntelliLang (8.0), J2ME (1.0), JBoss Arquillian Support (1.0), JBoss Drools Support (1.0), JBoss Frameworks Base Support (1.0), JBoss Integration (1.0), JBoss Seam Pageflow Support (1.0), JBoss Seam Pages Support (1.0), JBoss Seam Support (1.0), JBoss jBPM (2.0.0), JSR45 Integration (1.0), JUnit (1.0), Java Bytecode Decompiler (183.5912.21), Java EE: Batch Applications (1.0), Java EE: Bean Validation Support (1.1), Java EE: Contexts and Dependency Injection (1.1), Java EE: EJB, JPA, Servlets (1.0), Java EE: JMS, JSON Processing, Concurrency, Transaction (1.0), Java EE: Java Server Faces (2.2.X.), Java EE: RESTful Web Services (JAX-RS) (1.0), Java EE: Web Services (JAX-WS) (1.9), Java EE: WebSockets (1.0), Java Server Pages (JSP) Integration (1.0), Java Stream Debugger (183.5912.21), JavaFX (1.0), JavaScript Debugger (1.0), JavaScript Intention Power Pack (0.9.4), JavaScript Support (1.0), Jetty Integration (1.0), Kotlin (1.3.11-release-IJ2018.3-1), Less support (183.5912.21), Markdown support (183.5912.21), Maven Integration (183.5912.21), Maven Integration Extension (183.5912.21), OpenShift integration (1.0), Osmorc (1.4.12), Perforce Integration (2.0), Performance Testing (183.5912.21), Persistence Frameworks Support (1.0), Playframework Support (1.0), Properties Support (183.5912.21), Reactor framework support (1.0), Refactor-X (2.01), Remote Hosts Access (183.5912.21), Resin Integration (8.1), SSH Remote Run (0.1), Sass support (183.5912.21), Settings Repository (183.5912.21), Smali Support (1.0), Spring AOP/@AspectJ (1.0), Spring Batch (1.0), Spring Boot (1.0), Spring Data (1.0), Spring Integration Patterns (1.0), Spring MVC (1.0), Spring OSGi (1.0), Spring Security (1.0), Spring Support (1.0), Spring Web Flow (1.0), Spring Web Services (1.0), Spring WebSocket (1.0), Spy-js (183.5912.21), Struts 1.x (2.0), Struts 2 (1.0), Stylus support (999.999), TFS (999.999), Tapestry support (1.0), Terminal (0.1), TestNG-J (8.0), Thymeleaf (1.0), Tomcat and TomEE Integration (1.0), UML Support (1.0), Vaadin Support (1.0), Velocity support (1.0), W3C Validators (2.0), WSL Support Framework (183.5912.21), WebLogic Integration (1.0), WebSphere Integration (1.0), XPathView + XSLT Support (4), XSLT-Debugger (1.4), YAML (183.5912.21), ZKM-Unscramble (1.0), dmServer Support (0.9.5), tslint (183.5912.21)